Savitz, Leonard D., author
John Wiley & Sons, 1978
Buku Teks
Arrigo, Bruce A., author
San diego, 2003
Buku Teks
Heidensohn, Frances, author
Macmillan, 1993
Buku Teks
Klaus Rotzscher, editor
Springer, 2014
Buku Teks
Wilson, P. R., author
University of Queensland, 1973
Buku Teks