Cita APA (7a ed.)

Webb Society. (1979). Webb Society deep-sky observer's handbook: V 2. Planetary and Gaseous nebulae. Enslow Publishers.

Cita Chicago Style (17a ed.)

Webb Society. Webb Society Deep-sky Observer's Handbook: V 2. Planetary and Gaseous Nebulae. Hillside: Enslow Publishers, 1979.

Cita MLA (9a ed.)

Webb Society. Webb Society Deep-sky Observer's Handbook: V 2. Planetary and Gaseous Nebulae. Enslow Publishers, 1979.