Swayne, Linda E., author
Prentice-Hall International, 1989
Buku Teks
edited by E. Jerome McCarthy, John F. Grashof, Andrew A. Brogowicz
Richard D. Irwin, 1984
Buku Teks
Dunn, Charles, author
Macmillan, 1971
Buku Teks
Lamb, Charles W., author
Houghton Mifflin, 1987
Buku Teks
Lazo, Hector, author
McGraw-Hill, 1961
Buku Teks