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..
Chicago-Zitierstil (17. Ausg.)International Astronomical Union. Symposium Basel, Switzerland, International Astronomical Union, W. Becker, und 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.
MLA-Zitierstil (8. Ausg.)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.