Shapley, H., & Howarth, H. E. (1929). A source book in astronomy. McGraw-Hill.
Chicago Style (17th ed.) CitationShapley, Harlow, and Helen E. Howarth. A Source Book in Astronomy. New York: McGraw-Hill, 1929.
MLA (9th ed.) CitationShapley, Harlow, and Helen E. Howarth. A Source Book in Astronomy. McGraw-Hill, 1929.
Warning: These citations may not always be 100% accurate.