APA (7e ed.) Bronvermelding

Heyden, F. J. (1975). The complete astronomer (Trial ed.). Ateneo de Manila.

Chicago (17e ed.) Bronvermelding

Heyden, Francis J. The Complete Astronomer. Trial ed. Quezon City: Ateneo de Manila, 1975.

MLA (9e ed.) Bronvermelding

Heyden, Francis J. The Complete Astronomer. Trial ed. Ateneo de Manila, 1975.