Cita APA (7a ed.)

McKillip, P. A. (1979). Riddle of stars. Nelson Doubleday Inc..

Cita Chicago Style (17a ed.)

McKillip, Patricia A.. Riddle of Stars. Garden City: Nelson Doubleday Inc., 1979.

Cita MLA (9a ed.)

McKillip, Patricia A.. Riddle of Stars. Nelson Doubleday Inc., 1979.