Summers, George W.
Wadsworth, 1973
Buku Teks
Hoel, Paul Gerhard, 1905-, author
Wiley, 1982
Buku Teks
Summer, George W.
Wadsworth, 1985
Buku Teks
Picconi, Mario J.
Harper Collins, 1995
Buku Teks
Spurr, William A., author
Richard D. Irwin, 1961
Buku Teks