کتاب های Gene Helfman

Fishes: The Animal Answer Guide
Gene Helfman, 2011
The Diversity of Fishes: Biology, Evolution, and Ecology
Gene Helfman, 2009
The diversity of fishes: biology, evolution, and ecology
Gene S. Helfman, 2009
Celebrating Nature; Rites and Ceremonies around the world
Elizabeth S. Helfman, 1969