Berg, Bruce L. (Bruce Lawrence), 1954-, author
Allyn and Bacon, 1992
Buku Teks
Trautman, Neal E., author
Charles C Thomas Publisher, 1990
Buku Teks
edited by Jack Pinkowski
CRC Press, Taylor & Francis Group, 2008
Buku Referensi
Robbins, Harvey.
Berrett-Koehler, 2000
Buku Teks
Germann, A.C., author
C.C. Thomas, 1971
Buku Teks