Cobban, Alfred, author
Braziller, 1965
Buku Teks
Cobban, Alfred, author
Penguin Books, 1990
Buku Teks
Hoffding, Harold, author
Dover, 1955
Buku Teks
Guerard, ALbert
Ann Arbor The University of Michigan 1959
Buku Teks
Cobban, Alfred, author
[publisher not identified], [date of publication no identified]
Buku Teks