Biggs, John B., author
McGraw-Hill, 2011
Buku Teks
D`Andrea, Vaneeta-Marie, author
Open University Press, 2005
Buku Teks
Evans, Norman, 1923-, author
Routledge, 2001
Buku Teks
Meyers, Chet, author
Jossey-Bass Publishers , 1993
Buku Teks
Hogan, Christine, author
Eruditions, 1999
Buku Teks