Jaimes, R. F. (2011). THE GLOBULAR CLUSTER NGC 6981: VARIABLE STARS POPULATION, PHYSICAL PARAMETERS AND ASTROMETRY. Universidad Nacional Autónoma de México.
Citazione stile Chigago Style (17a edizione)Jaimes, R. Figuera. THE GLOBULAR CLUSTER NGC 6981: VARIABLE STARS POPULATION, PHYSICAL PARAMETERS AND ASTROMETRY. Universidad Nacional Autónoma de México, 2011.
Citatione MLA (9a ed.)Jaimes, R. Figuera. THE GLOBULAR CLUSTER NGC 6981: VARIABLE STARS POPULATION, PHYSICAL PARAMETERS AND ASTROMETRY. Universidad Nacional Autónoma de México, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.