Hallam, Henri
J.M. Dent & Sons LTD, 1936
Buku Teks
Dudden, Arthur Power, 1921-, author
University of Pennsylvania Press, 1963
Buku Teks
Stringer, Janet L., author
McGraw-Hill , 2001
Buku Teks
Harrison, John B.
Alfred A. Knopf, 1969
Buku Teks
Major, J. Russel, author
J.B. Lippincott, 1966
Buku Teks