Schmidt, Erich W., author
Pergamon Press , 1974
Buku Teks
Swartz, Clifford E.
John Wiley & Sons, 1981
Buku Teks
John Wiley & Sons, 1969
Buku Teks
Hasugian, Rudy, author
Universitas Indonesia, 2007
UI - Skripsi (Membership)
Abraham, Ralph
W.A. Benjamin , 1967
Buku Teks