Artikel Jurnal
Manuel, A. Arsenio
Manila: Filipiniana Publications, 1948
Buku Teks
Weston, J. Fred (John Fred), 1916-, author
McGraw-Hill, 2001
Buku Teks
edited by Karen Parrish and Bill Katz
Hawarth Press, 1993
Buku Teks
Lie, Tektjeng, author
Lembaga Ilmu Pengetahuan Indonesia, 1970
Buku Teks