Rue, Leslie W., author
McGraw-Hill Publishing Company, Ltd., 1989
Buku Teks
Kers, Marijke
Bv Laren, 1984
Buku Referensi
Timmermans, Felix, 1886-1947, author
Davidsfonds, 1993
Buku Teks
Churchill, W.A., author
Menno Hertzberger & Co., 1935
Buku Referensi
Visser, Hans G., author
Conserve, 1992
Buku Teks