Theus, Martin, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Barrett, C.S., author
Pergamon Press, 1980
Buku Teks
Marz, Nathan, author
Manning, 2015
Buku Teks
Couger, J. Daniel, author
John Wiley & Sons, 1984
Buku Teks
Wheeler, Daniel W., author
Jossey-Bass, 2012
Buku Teks