Marcus, Edward, author
Pitman, 1965
Buku Teks
Root, Franklin R., author
South-Western Publishing, 1978
Buku Teks
Root, Franklin R., author
International Thompson Publishing, 1994
Buku Teks
Gipson, Carolyn R., author
McGraw-Hill, 1994
Buku Referensi
Appleyard, Dennis R., author
McGraw-Hill, 2014
Buku Teks