Frain, H. LaRue
Hougton Mifflin Company, 1937
Buku Teks
McKenzie, Richard B., author
McGraw-Hill, 1978
Buku Teks
Goodman, Alvin S., author
McGraw-Hill, 2015
Buku Teks
Leftwich, Richard H., author
United States of America, 1984
Buku Teks
Craven, John, 1949-, author
Blackwell, 1984
Buku Teks