Wylie, Herry L.
Prentice-Hall, 1961
Buku Teks
Kallaus, Norman Francis, 1924-, author
South-Western Publishing, 1987
Buku Teks
Terry, George Robert, author
Richard D. Irwin, 1975
Buku Teks
Fairbanks, Ralph W., author
Prentice-Hall, 1956
Buku Teks
Foster, Thelma J.
Stanley Thornes, 1994
Buku Teks