APA (7th ed.) Zitazioa

ebrary, Inc, & Melark, P. G. (2012). Comets: Characteristics, composition and orbits. Nova Science Publishers.

Chicago Style (17th ed.) Zitazioa

ebrary, Inc, eta Peter G. Melark. Comets: Characteristics, Composition and Orbits. Hauppauge, N.Y.: Nova Science Publishers, 2012.

MLA (9th ed.) Zitazioa

ebrary, Inc, eta Peter G. Melark. Comets: Characteristics, Composition and Orbits. Nova Science Publishers, 2012.