I may have mentioned some books, but I doubt it. More likely it was Peter Pontikis. He often refers people to Nauzer J Balsara Money Management Strategies for Futures Traders (Wiley). Another (somewhat difficult) book on this subject is Ralph Vince Portfolio Management Formulas (Wiley).
There are good discussions also in:
Robert Rotella The Elements of Successful Trading (NYIF)
Dr Alexander Elder Trading for a Living (Wiley)
Richard Teweles and Frank Jones The Futures Game (McGraw-Hill)