Cobban, Alfred
Braziller, 1965
Buku Teks
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
edited by Mary Ellen Waithe.
Kluwer Academic, 1991
Buku Teks