SpringerLink (Online service), International Astronomical Union. Symposium, Fehrenbach, C., & Westerlund, B. E. (1973). Spectral classification and multicolour photometry: Symposium no. 50 held in Villa Carlos Paz, Argentina, October 18-24, 1971. D. Reidel.
Chicago Style (17th ed.) CitationSpringerLink (Online service), International Astronomical Union. Symposium, Ch Fehrenbach, and Bengt E. Westerlund. Spectral Classification and Multicolour Photometry: Symposium No. 50 Held in Villa Carlos Paz, Argentina, October 18-24, 1971. Dordrecht: D. Reidel, 1973.
MLA (9th ed.) CitationSpringerLink (Online service), et al. Spectral Classification and Multicolour Photometry: Symposium No. 50 Held in Villa Carlos Paz, Argentina, October 18-24, 1971. D. Reidel, 1973.
Warning: These citations may not always be 100% accurate.