Peters, Lynn H.
Dickenson Publishing Company, 1968
Buku Teks
Peters, Lance
Angus & Robertson, 1988
Buku Teks
Peters, Max, author
McGraw-Hill, 1984
Buku Teks
Mussey, Henry R.
Ginn and Company, 1947
Buku Teks
Smith, Howard R.
The Ronald Press Company , 1958
Buku Teks