Insel, Paul M., author
McGraw-Hill, 2012
Buku Teks
Sage Publications, 2012
eBooks
Robinson, James, 1943-, author
Delmar, 2011
Buku Teks
Murray, Ruth Beckmann, author
Prentice-Hall, 1985
Buku Teks
Spradley, Barbara Walton, author
Little, Brown , 1985
Buku Teks