Below you can download an article by David Mech concerning his statements about the term "Alpha" in wolf packs.
Group Composition Effects on Aggressive Interpack Interactions of Gray Wolves in Yellowstone National Park
Prolonged Intensive Dominance Behavior Between Gray Wolves, Canis lupus, David Mech and Dean Cluff, 2010
Leadership behavior in relation to dominance and reproductive status in gray wolves, Canis lupus, David Mech 2002
Leadership in Wolf, Canis lupus, Packs, David Mech – 2000
Alpha Status, Dominance, and Division of Labor in Wolf Packs by L. David Mech – 1999