Birren, Faber, author
Van Nostrand Reinhold, 1978
Buku Teks
Cambridge University Press, 2016
eBooks
Michael, author
Chronicle Books, 2000
Buku Referensi
Linton, Harold, author
McGraw-Hill, 1999
Buku Teks
Gill, Martha, author
Rockport Publishers, 2000
Buku Teks