Gw mau tau Cathetan suku dari George O. Abell. Jelasin dalam bahasa jawa

University of California: In Memoriam, 1985

Abell, George, "Exploration of the Universe", Holt, Rinehart and Winston (Copyright 1964)

Abell, G.O., Morrison, D., and Wolff, S.C., Exploration of the Universe, Saunders College Pub; 6th/Rev edition (February, 1993) ISBN 0-03-094666-2

Abell, G.O., Wolff, S.C., and Morrison, D., Realm of the Universe, Saunders College Publishing; 5th ed., 1994 edition (January, 1994) ISBN 0-03-001664-9

Abell, G.O., A catalog of rich clusters of galaxies'', American Astronomical Society (1989) ASIN B000726Y06