Barlow, R.B., author
Methuen, 1964
Buku Teks
Gerald, Michael C., author
Prentice-Hall, 1981
Buku Teks
edited by Ene I. Ette and Paul J. Williams
John Wiley & Sons, 2007
eBooks
Edmunds, Marilyn W., author
Mosby Elsevier, 1995
Buku Teks
edited by John A. Bevan
Harper & Row, 1976
Buku Teks