O`Sullivan, Terence, author
Macmillan, 1999
Buku Teks
Miley, Karla Krogsrud, 1942-, author
Pearson, 2014
Buku Teks
Collins, Barry E., author
John Wiley & Sons, 1964
Buku Teks
Weiss, Carol H.
Columbia Univ. Press, 1980
Buku Teks
Morales, Armando, author
Allyn and Bacon, 1983
Buku Teks