Brent, Nancy J.
W.B.Sounders company , 2001
Buku Teks
Denniston, Katherine J.
Wm. C. Brown, 1993
Buku Teks
Skidmore-Roth, Linda
Mosby, Elsevier, 2009
Buku Referensi
Deglin, Judith Hopfer, 1950-
FA Davis, 2001
Buku Teks
Bodinski, Louis H.
John Wiley & Sons, 1982
Buku Teks