Beal, Virginia A.
Macmillan, 1986
Buku Teks
Alford, Betty B.
Prentice-Hall, 1982
Buku Teks
Bogert, L. Jean (Lotta Jean), 1888-1970, author
W.B. Saunders, 1973
Buku Teks
Wardlaw, Gordon M., 1912-1989, author
McGraw-Hill, 2012
Buku Teks
Byrd-Bredbenner, Carol, author
McGraw-Hill, 2013
Buku Teks