APA (7th ed.) Citation

Swings, P., & Haser, L. (1956). Atlas of representative cometary spectra. [Imprimerie Ceuterick].

Chicago Style (17th ed.) Citation

Swings, P., and L. Haser. Atlas of Representative Cometary Spectra. [Louvain]: [Imprimerie Ceuterick], 1956.

MLA (9th ed.) Citation

Swings, P., and L. Haser. Atlas of Representative Cometary Spectra. [Imprimerie Ceuterick], 1956.