Olsen, Edward A, author
Praeger Security International, 2005
Buku Teks
Angle, Paul M
Fawcett Publications,Inc, 1960
Buku Teks
Woodward, Ralph Lee, author
Oxford University Press , 1985
Buku Referensi
Olsen, Jack
G.P. Putnam's Sons, 1968
Buku Teks
Elliott, J. H., author
Collins, 1968
Buku Teks