Reynolds, Lloyd G.
Richard D. Irwin, 1982
Buku Teks SO
DeLong, J. Bradford
McGraw-Hill, 2002
Buku Teks
Frank, Robert H.
McGraw-Hill/Irwin, 2004
Buku Teks
Reynolds, Lloyd G.
Yale University Press, 1971
Buku Teks
Reynold, Lloyd George
McGraw-Hill, 1981
Buku Teks SO