Cita APA (7a ed.)

Perek, L., & Kohoutek, L. (1967). Catalogue of galactic planetary nebulae. Academia Publishing House of the Czechoslovak Academy of Sciences.

Cita Chicago Style (17a ed.)

Perek, Lubos, y Lubos Kohoutek. Catalogue of Galactic Planetary Nebulae. Prague: Academia Publishing House of the Czechoslovak Academy of Sciences, 1967.

Cita MLA (8a ed.)

Perek, Lubos, y Lubos Kohoutek. Catalogue of Galactic Planetary Nebulae. Academia Publishing House of the Czechoslovak Academy of Sciences, 1967.