ebrary, Inc, & Melark, P. G. (2012). Comets: Characteristics, composition and orbits. Nova Science Publishers.
Citazione stile Chigago Style (17a edizione)ebrary, Inc, e Peter G. Melark. Comets: Characteristics, Composition and Orbits. Hauppauge, N.Y.: Nova Science Publishers, 2012.
Citatione MLA (9a ed.)ebrary, Inc, e Peter G. Melark. Comets: Characteristics, Composition and Orbits. Nova Science Publishers, 2012.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.