McClosky, Herbert, author
McGraw-Hill, 1960
Buku Teks
Best, Harry
Philosophical Library, 1951
Buku Teks
Shitikov, Alexei
Novosty Press Agency Publishing Hause , 1978
Buku Teks
Oxford University Press, 1951
Buku Teks
Fischer, George, author
Harvard University Press, 1952
Buku Teks