Sitompul, Asril
Citra Aditya Bakti, 2001
Buku Teks
Iman Sjahputra Tunggal
Prenhallindo, 2002
Buku Teks
Spinello, Richard A.
Jones and Bartlett Learning, 2017
Buku Teks
edited by Eric Brousseau, Meryem Marzouki and Cecile Meladel
Cambridge University Press, 2012
Buku Teks
Haynes, Colin
Aslib, 1995
Buku Teks