Los Angeles : John C. Winston, 1942
Buku Referensi
RIddle, K. Wilkinson, author
London Arco 1962
Buku Referensi
Brewer, E. Cobham, author
New York, Harper Brothers
Buku Referensi
Henderson, I. F., author
Harlow, England Longman Scientific and Technical
Buku Referensi
Page, G. Terry
New York Kogan Page 1977
Buku Referensi