Hoogendoorn, J., author
UI-Press, 1989.
Buku Teks
Deverell, C.S., author
London, Gee & Co
Buku Teks
McLarney, William J., author
Richard D. Irwin, 1961
Buku Teks
Hague, Hawden, author
Macmillan, 1974
Buku Teks
Hoogendoorn, J., author
UI-Press, 1989
Buku Teks