Cita APA (7th ed.)
Clark, D. H., & Stephenson, F. R. (1977). The historical Supernovae. Pergamon Pr.
Cita Chicago (17th ed.)
Clark, David H., i Francis Richard Stephenson. The Historical Supernovae. Oxford: Pergamon Pr, 1977.
Cita MLA (9th ed.)
Clark, David H., i Francis Richard Stephenson. The Historical Supernovae. Pergamon Pr, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.