Riebel, John P., author
Arco, 1978
Buku Teks
Sharples, Mike, 1952-, author
Routledge, 1999
Buku Teks
Aaron, David, author
Citadel Press , [1961]
Buku Teks
Perrin, Porter G., author
Scott, Foresman, 1950
Buku Teks
Scharton, Maurice
Allyn and Bacon, 1993
Buku Teks