Seven Seas, 1958
Buku Teks
Lane, Frederick A
Aladdin Books, 1954
Buku Teks
Leopard Books, 1980
Buku Teks
Niluh Widiyaning, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1997
UI - Skripsi (Membership)
London His Majesty's Stationery Office 1935
Buku Teks