Burkens, M. C. B
Kluwer, 1971
Buku Teks
Meuwissen, D.H.M.
W.E.J. Tjeenk Willink, 1975
Buku Teks
edited by George Clack
[publisher not identified], 1998
Buku Teks
Nickel, James W.
Blackwell , 2007
Buku Teks
Sagala, Shanty Sofiarli
Universitas Indonesia, 2008
UI - Skripsi (Open)