APA (7th ed.) Citation

Friedrich, D., & Schöffel, E. (1971). New bright southern variable stars.

Chicago Style (17th ed.) Citation

Friedrich, D., and Eberhard Schöffel. New Bright Southern Variable Stars. Bamberg, 1971.

MLA (9th ed.) Citation

Friedrich, D., and Eberhard Schöffel. New Bright Southern Variable Stars. 1971.

Warning: These citations may not always be 100% accurate.