Dator, James A., author
[, Springer], 2012
eBooks
Barusch, Amanda Smith, author
Brooks / Cole, 2009
Buku Teks
Barusch, Amanda Smith, author
Thomson Brooks/Cole, 2006
Buku Teks
Bell, Earl H.
Harper & Row, 1965
Buku Teks
Kottak, Conrad Phillip, author
McGraw-Hill , 1991
Buku Referensi