Hammaker, Donna, author
Delmar Cengage Learning, 2011
Buku Teks
Borkowski, Nancy, author
Jones & Bartlett Learning, 2016
Buku Teks
Mclaughnin, Curtis P., author
Jones & Bartlett Learning, 2015
Buku Teks
Bieliauskas, Linas A.
Westview Press, 1983
Buku Teks
edited by Chloe Sellwood, Andy Wapling
MA CABI, 2016
Buku Teks