[I]. Trends in biogas production technologies: Technological routes for biogas production : current status and future perspectives / Salvador Sánchez-Muñoz, Fernanda Gonçalves Barbosa, Jesús Jiménez-Ascencio, Edith Mier-Alba, Akhilesh Kumar Singh, Júlio César dos Santos et al.
Prospects and challenges in biogas technology : Indian scenario / Geetha Thanuja Kalyanasundaram, Anupriya Ramasamy, Blesy Godwin, Ramesh Desikan, Karthikeyan Subburamu
Anaerobic digestion technology for management of organic wastes : Latin American context / Jesús Rubén Rodríguez-Nuñez, Omar Surisadai Castillo Baltazar
Biogas technology for animal manure management in the USA : state of the art, opportunities, challenges, and perspectives / David Henry Huber
Anaerobic digestion in Europe : key to waste management, challenges, and perspectives / Efraín Reyes Cruz, Alicia Guadalupe Talavera-Caro, Aldo Almeida
Advances and challenges of anaerobic digestion of wastes and wastewaters from different industrial sectors / Reyna Roxana Guillén-Enríquez, Marcela Estefanía Téllez Reséndiz, Inty Omar Hernández-De Lira, Jesús Morlett Chávez
Comparative analysis of biogas with renewable fuels and energy : physicochemical properties and carbon footprints / Edith Mier-Alba, Salvador Sánchez-Muñoz, Fernanda Gonçalves Barbosa, Vijay Kumar Garlapati, Nagamani Balagurusamy, Silvio Silvério da Silva et al.

[II]. Improving biogas production : progress, challenges and perspectives: Potential feedstock for sustainable biogas production and its supply chain management / Richa Singh, Meenu Hans, Sachin Kumar, Yogender Kumar Yadav
Potentials and challenges of micro- and macroalgae as feedstock for biogas production / Adriana López-Villanueva, Sanjuanita María Del Sol Ugalde-Hurtado, Inty Omar Hernández-De Lira, Miriam Paulina Luevános-Escareño
The realm of microorganisms in biogas production : microbial diversity, functional role, community interactions, and monitoring the status of biogas plant / Alicia Guadalupe Talavera-Caro, Inty Omar Hernández-De Lira, Efraín Reyes Cruz, María Alejandra Sánchez-Muñoz, Nagamani Balagurusamy
Metabolic engineering : a tool to increase the methane yield and efficiency of anaerobic digestion process / María José Castro Alonso, Mariel Rubí Macías Franco, Armando Pacheco Valenciana, Lilia Ernestina Montañez-Hernández
Scale-up operations for biogas production : analysis on critical factors governing large-scale operations / Spyridon Achinas, Sotirios Longinos, Vasileios Achinas, Gerrit Jan Willem Euverink
Biogas processing, storage and distribution, transportation and value chain analysis / Madhurjya Das, Mainak Chakraborty, Senthil Chinnasamy, Balasubramanian Ramakrishnan
Potentials and challenges of biogas upgradation as liquid biomethane / Ram Chandra, Adya Isha, Subodh Kumar, Sameer Ahmad Khan, Paruchuri Mohan Venkata Subbarao, Virendra Kumar Vijay et al.
Nutrient value of digestates in soil fertility and crops productivity / Ayerim Hernández-Almanza, Liliana Londoño-Hernández, Gloria Alicia Martínez-Medina, Diana Alva-Sánchez.

[III]. Economics of biogas technology: Biogas commercialization : commercial players, key business drivers, potential market, and fostering investment / Shaileshkumar Sawale, Deepak Patil, Chaitanya Joshi, Basavaraj Rachappanavar, Debadatta Mishra, Aarohi Kulkarni
Biogas in circular bio-economy : sustainable practice for rural farm waste management and techno-economic analyses / José Alberto Silva-González, Anuj Kumar Chandel, Silvio Silvério da Silva, Nagamani Balagurusamy
Biogas technology in Africa : an assessment of feedstock, barriers, socio-economic impact and the way forward / Ashira Roopnarain, Busiswa Ndaba, Maryam Bello-Akinosho, Emomotimi Bamuza-Pemu, Mashudu Mukhuba, Rosina Nkuna et al.
Governmental policies to promote biogas production, boosing role of biogas in economic growth of developing nations / Mónica María Cruz-Santos, Mariel Rubí Macías-Franco, Karla Sofia Herrera-Medina, Erick Diaz-Ruiz, Anuj Kumar Chandel, Júlio César dos Santos et al.