APA
Popkin R. H., Stroll A., . (1956). Philosophy made simple. New York: Made Simple Books; distributed to the book trade by Garden City Books, Garden City, N.Y.
Chicago
Popkin Richard H, Stroll Avrum, . 1956. Philosophy made simple. New York: Made Simple Books; distributed to the book trade by Garden City Books, Garden City, N.Y.
Harvard
Popkin R. H., Stroll A., . (1956). Philosophy made simple. New York: Made Simple Books; distributed to the book trade by Garden City Books, Garden City, N.Y.
MLA
Popkin Richard H, Stroll Avrum, . Philosophy made simple. New York: Made Simple Books; distributed to the book trade by Garden City Books, Garden City, N.Y. 1956.