APA (7th ed.) Citation

Unsöld, A., Baschek, B., Kegel, W. H., & Traving, G. (1975). Problems in stellar atmospheres and envelopes. Springer-Verlag.

Chicago Style (17th ed.) Citation

Unsöld, Albrecht, B. Baschek, Wilhelm H. Kegel, and G. Traving. Problems in Stellar Atmospheres and Envelopes. New York: Springer-Verlag, 1975.

MLA (9th ed.) Citation

Unsöld, Albrecht, et al. Problems in Stellar Atmospheres and Envelopes. Springer-Verlag, 1975.