Cobban, Alfred
Braziller, 1965
Buku Teks SO
Guerard, ALbert
Ann Arbor The University of Michigan 1959
Buku Teks
Cobban, Alfred
[Publisher not identified], [date of publication no identified]
Buku Teks
Hoffding, Harold
Dover, 1955
Buku Teks SO
Smith, Preserved
Collier Books, 1962
Buku Teks SO