Cohen, L. Felissa
Buku Teks
edited by Beverly J. Rambo, Lucile A. Wood
W.B. Saunders, 1982
Buku Teks SO
edited by Jeyanth Asheervath and Dorothy R. Blevins
Appleton-Century-Crofts, 1986.
Buku Referensi
Matloff, Ellen T.
Wolters Kluwer, 2013
Buku Teks SO
Hickey, Joanne V.
Lippincott, 1986
Buku Teks SO