Torres, Gertrude
Practice-Hall , 1982
Buku Teks
Deane, Donna
Reston, 1985
Buku Teks
Pohl, Margaret L., author
WM.C. Brown , 1978
Buku Teks
Bellings, Diane M., author
Saunders Elsevier, 2009
Buku Teks
Tornyay, Rheba de, author
John Wiley & Sons, 1987
Buku Teks