Martelino, Eduardo L.
Pageant Press , 1959
Buku Teks
Janda, Kenneth, author
Houghton Mifflin, 2000
Buku Teks
Robert E. Diclerico, Allan S. Hammock, editor
McGraw-Hill, 2009
Buku Teks
Highsaw, Robert B.
Thomas Y. Crowell Company, 1954
Buku Teks
by James W. Ceaser ... [and others]
McGraw-Hill , 1984
Buku Teks