Olson, Everett C., author
Charles E. Merrill, 1975
Buku Teks
Volpe, E. Peter (Erminio Peter), author
Universal Books Stall, 1996"
Buku Teks
Childe, Gordon, author
Watts, 1952
Buku Teks
Prothero, Donald R., author
McGraw-Hill, 2010
Buku Teks
Parsons, Talcott, author
Prentice-Hall, 1977
Buku Teks