Hansen, Harry
A Mentor Book, 1961
Buku Teks SO
Preston, Paul
Dorsey Press, 1986
Buku Teks SO
Thomas, Hugh
Harper & Brothers, 1961
Buku Teks SO
Mitchell, Joseph B. [Joseph Brady], 1915-
G.P. Putnam, 1955
Buku Teks SO
Pratt, Fletcher, 1897-1956
Pocket Books, 1948
Buku Teks SO