Charvat, Frank J.
Heath, 1966
Buku Teks
Hansen, Harry L., author
Richard D. Irwin, 1964
Buku Teks
Hansen, Harry L., author
Richard D. Irwin, 1956
Buku Teks
Narver, John C., author
Holt, Rinehart and Winston, 1971
Buku Teks
Hansen, Harry L., author
Richard D. Irwin, 1968
Buku Teks