Fritz, William J.
John Wiley & Sons, 1988
Buku Referensi
Andi Ruswandi
Universitas Indonesia, 2001
UI - Tesis Membership
Hutabarat, Sanggam
Universitas Indonesia, 2006
UI - Tesis Membership
Blatt, Harvey
W.H. Freeman, 1982
Buku Teks
Mason, Brian
John Wiley & Sons, 1951
Buku Teks