Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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