Cummings, Michael R., author
Brooks/Cole, Cengage Learning, 2011
Buku Teks
Winchester, A.M., author
Hoghton Mifflin, 1959
Buku Teks
Dunn, L.C., author
The New American Library, [1952]
Buku Teks
Fraser, Alex
McGraw-Hill, 1966
Buku Teks
Lock, Robert Heath, author
Cambridge University Press, 2013
Buku Teks