APA (7th ed.) Citation

Moulton, F. R. (1906). An introduction to astronomy. The Macmillan company; Macmillan & co., ltd..

Chicago Style (17th ed.) Citation

Moulton, Forest Ray. An Introduction to Astronomy. New York : London: The Macmillan company; Macmillan & co., ltd., 1906.

MLA (9th ed.) Citation

Moulton, Forest Ray. An Introduction to Astronomy. The Macmillan company; Macmillan & co., ltd., 1906.

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