Jones, Gavin W.
Irvington, 1975
Buku Teks
Chandrasekhar, S.
University of North Carolina Press, 1972
Buku Teks
Tan, Ngoc Chau
Unesco, 1972
Buku Teks SO
edited and with Introductions by Paul E. Sigmund
Frederick A. Praeger, 1967
Buku Teks SO
Gamer, Robert E.
Allyn and Bacon, 1976
Buku Teks SO