Geer, John Gray
Wadsworth and Cengage Learning, 2012
Buku Teks
by William J. Keefe ... [and others]
The Dorsey Press, 1983
Buku Teks
Padover, Saul K. (Saul Kussiel), author
Frederick A. Praeger, 1963
Buku Teks
Herring, E. Pendleton, author
Norton, 1966
Buku Teks
Bernstein, Marver H.
Holt, Rinehart and Winston, 1960
Buku Teks