Franklin

MLA

Cps Utilities: October 1984, 1989, 1997, November 1994 and December 1998. Version 3.3.4 Santa Monica, CA: Unicon Research Corporation, 2000.

APA

(2000). CPS utilities: October 1984, 1989, 1997, November 1994 and December 1998. Version 3.3.4 Santa Monica, CA: Unicon Research Corporation.

Chicago

CPS Utilities: October 1984, 1989, 1997, November 1994 and December 1998. Version 3.3.4 Santa Monica, CA: Unicon Research Corporation, 2000.