ABELL, G. O. (1980). Realm of the universe.-- Ed.2. Saunders College.
Chicago-čujuhus (17. p.)ABELL, George O. Realm of the Universe.-- Ed.2. Philadelphia: Saunders College, 1980.
MLA-čujuhus (9. p.)ABELL, George O. Realm of the Universe.-- Ed.2. Saunders College, 1980.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.