Cita APA (7a ed.)

JOHN DUNCAN. (2019). ASTRONOMY (2016 Ed.). PARRAGON BOOK PUBLISHERS.

Cita Chicago Style (17a ed.)

JOHN DUNCAN. ASTRONOMY. 2016 Ed. LONDON: PARRAGON BOOK PUBLISHERS, 2019.

Cita MLA (9a ed.)

JOHN DUNCAN. ASTRONOMY. 2016 Ed. PARRAGON BOOK PUBLISHERS, 2019.