Kurihara, Kenneth K., author
W.W. Nortorn, 1950
Buku Teks
Phelps, Edmund S.
Orton & Co , 1962
Buku Teks
edited by Paul L. Kleinsorge
University of Oregan Books, 1966
Buku Teks
Mueller, Dennis C., author
Cambridge University Press, 2005
Buku Teks
Lembaga Penelitian Universitas Indonesia, 1985
UI - Laporan Penelitian