Billings, Diane M.
Elsevier/Saunders, 2012
Buku Teks SO
edited by Susan M. Hincliff
Churchill livingstone , 1979
Buku Teks SO
Tornyay, Rheba de
John Wiley & Sons, 1987
Buku Teks SO
Pohl, Margaret L.
WM.C. Brown , 1978
Buku Teks SO
Helen L. Van Hoozer [and others]
Appleton Century Crofts, 1987
Buku Teks SO