Swartz, Clifford E.
John Wiley & Sons, 1981
Buku Teks
John Wiley & Sons, 1969
Buku Teks
Schmidt, Erich W., author
Pergamon Press , 1974
Buku Teks
Hasugian, Rudy, author
Universitas Indonesia, 2007
UI - Skripsi (Membership)
Will, Clifford M., 1946-, author
Cambridge University Press, 1981
Buku Teks