APA (7th ed.) Citation

Sinnott, R. W. (1997). A 6-inch camera obscura. Sky & Telescope, 93(1), 96.

Chicago Style (17th ed.) Citation

Sinnott, Roger W. "A 6-inch Camera Obscura." Sky & Telescope 93, no. 1 (1997): 96.

MLA (9th ed.) Citation

Sinnott, Roger W. "A 6-inch Camera Obscura." Sky & Telescope, vol. 93, no. 1, 1997, p. 96.