Levine, Arthur, author
[publisher not identified], [date of publication not identified]
Buku Teks
Byrd, Patricia, author
Prentice-Hall, 1981
Buku Referensi
edited by Russell M. Cooper
University of Minnesotta Press , 1958
Buku Teks
Dorothy B. Durband
Springer, 2012
eBooks
Donaldson, K., author
McGraw-Hill, 1999
Buku Teks