Harmon, M. Judd
McGraw-Hill, 1964
Buku Teks
Ebenstein, William, author
Rinehart, 1963
Buku Teks
Elsevier, 2004
Buku Teks
edited by Edward Dumbauld
Liberal Arts Press, 1955
Buku Teks
Robinson, Marguerite S., author
Cambridge University Press, 1975
Buku Teks