Cummings, Milton C.
Harcourt Brace Jovanovich, 1977
Buku Teks
by Robert Bartley [and others]
ISEAS, 1994
Buku Teks
McKenna, George, author
McGraw-Hill, 1998
Buku Teks
Hall, John Oliver, author
American Book Company, 1958
Buku Teks
Geer, John Gray
Wadsworth and Cengage Learning, 2012
Buku Teks