Helen L. Van Hoozer [and others]
Appleton Century Crofts, 1987
Buku Teks
Ewan, Christine
Croom Helm, 1984
Buku Teks
by Nancy I. Whitman [and others]
Appleton Century, 1986
Buku Teks
Seelye, H. Ned
National Textbook, 1976
Buku Teks
Bates, Tony, 1939-, author
Jossey-Bass, 2011
Buku Teks