Yee, Young P., author
Springer, 2012
eBooks
Service, Elman R. (Elman Rogers), 1915-1996, author
Harper & Row, 1963
Buku Teks
edited by Klaus Florey
Academic Press, 1984
Buku Teks
East, Roger, author
Routledge, 2006
Buku Referensi
Vaughn, Donald E., author
Prentice-Hall, 1997
Buku Teks