Schoonheyt, Louis Johan Alexander
Drukkerij Visser, 1937
Buku Klasik
Nanda, Serena
Wadsworth, 2002
Buku Teks
Barnouw, Victor
The Dorsey Press, 1975
Buku Teks
Atkinson, Paul
Routledge, 1994
Buku Teks
Schusky, Ernest l.
Holt Rinehart and Winston, 1975
Buku Teks