1.
|
Indianapolis : Hackett Pub. Co., c2001.
|
2.
|
Indianapolis : Hackett, c1991.
|
3.
|
London, G. Allen & Unwin, ltd; New York, The Macmillan company [1931]
|
4.
|
Notre Dame, Indiana : University of Notre Dame Press, [2019] ©2019
|
5.
|
New York, Modern Library [c1954]
|
6.
|
Buffalo, NY : Prometheus Books, 1991.
|
7.
|
Chicago : Encyclopædia Britannica, c1952.
|