Washington, D.C. I.C.A. 1957,
Buku Teks
London Messrs Luzac 1943
Buku Teks
edited by Robert L. Clark, Jr.
R.R. Bowker, 1976
Buku Teks
Fennelly, Lawrence J., author
Butterworth, 1983
Buku Teks
Sears, Francis W. (Francis Weston), 1898-1975, author
Addison-Wesley, 1962
Buku Teks