International Astronomical Union. Symposium Basel, Switzerland, International Astronomical Union, Becker, W., & Contopoulos, G. (1970). The spiral structure of our galaxy: International Astronomical Union Symposium No. 38 held in Basel, Switzerland, August 29-September 4, 1969. D. Reidel Publ. Co..
Style de citation Chicago (17e éd.)International Astronomical Union. Symposium Basel, Switzerland, International Astronomical Union, W. Becker, et George Contopoulos. The Spiral Structure of Our Galaxy: International Astronomical Union Symposium No. 38 Held in Basel, Switzerland, August 29-September 4, 1969. Dordrecht, Holland: D. Reidel Publ. Co., 1970.
Style de citation MLA (8e éd.)International Astronomical Union. Symposium Basel, Switzerland, et al. The Spiral Structure of Our Galaxy: International Astronomical Union Symposium No. 38 Held in Basel, Switzerland, August 29-September 4, 1969. D. Reidel Publ. Co., 1970.