Garrison, Web
The Lion Press, 2002
Buku Teks
Hansen, Harry, author
A Mentor Book, 1961
Buku Teks
Thomas, Hugh, author
Harper & Brothers, 1961
Buku Teks
Preston, Paul, author
Dorsey Press, 1986
Buku Teks
Mitchell, Joseph B. (Joseph Brady), 1915-, author
G.P. Putnam, 1955
Buku Teks