Little, Ian M.D.
George Allen and Unwin, 1965
Buku Teks
Lancaster, Carol, author
Brooking Institution Press, 2005
Buku Teks
Friedmann, Wolfgang, 1907-1972, author
Columbia University Press, 1966
Buku Teks
Chandrasekhar, S., author
Frederick A. Praeger, 1965
Buku Teks
Arnold, H.J.P., author
Dufour Editions, 1966
Buku Teks