McDonald, Ralph E.
Mosby , 1987
Buku Teks
edited by Joseph D. Noshpitz
John Wiley & Sons, 1997
Buku Referensi
Wicks-Nelson, Rita, author
Pearson Education, 2014
Buku Teks
Semrud-Clikeman, Margaret, author
Allyn and Bacon, 1995
Buku Teks
Kamphaus, Randy W, author
Pringer Science+Business Medi, 2005
Buku Teks