Clark, Wilfrid E. Le Gros, author
Quadrangle Books, 1971
Buku Teks
Brace, C. Loring, author
Macmillan, 1969
Buku Teks
Dolhinow, Phyllis, author
McGraw-HIll, 2002
Buku Teks
Dolhinow, Phyllis, author
McGraw-HIll, 2002
Buku Teks
Quigley, Carroll
Macmillan, 1961
Buku Teks