Blair, Walter
Scott, Foresman and Company, 1948
Buku Teks
Grolier Incorporated, 1997
Buku Referensi
Barnes, Harry Elmer
Prentice Hall of India, 1966
Buku Teks
Zeng, Fan-Gang, editor
Springer, 2011
eBooks
edited by Gerald W. Whitted
Pan American World Airways, 1971
Buku Referensi