Pearman, William A. and Starr, Philip
New York : Garland Publishing, 1988,
Buku Referensi
Artikel Jurnal
Goel, S. L., author
Deep & Deep Publications PVT, 2001
Buku Teks
Goldsmith, Seth B., author
Jones & Bartlett, 2011
Buku Teks
Donald L. Zimmerman and Denise G. Osborn-Harrison, editors
NY Springer Publishing Company, 2017
Buku Teks