Saada, Adel S., author
Florida Krieger, 1993
Buku Teks
Berndt, Ronald M., author
University Microfilms International, 1954
Buku Teks
Cobban, Alfred, author
Braziller, 1965
Buku Teks
Hauser, Arnold, author
Alfred A. Knopf , 1952
Buku Teks
Hoffding, Harold, author
Dover, 1955
Buku Teks