DeLamater, John D., author
Colorado Westview Press, 2014
Buku Teks
Lorayne, Harry
Golden Books Centre SDN. BDN, 1992
Buku Teks
Pines, Ayala, author
McGraw-Hill, 1993
Buku Teks
Zastrow, Charles, author
Cengage Learning, 2016
Buku Teks
Baron, Robert A., author
Heights Allyn and Bacon , 1991
Buku Teks