APA (7th ed.) Citation

Willach, R. (2008). The long route to the invention of the telescope. American Philosophical Society.

Chicago Style (17th ed.) Citation

Willach, Rolf. The Long Route to the Invention of the Telescope. Philadelphia: American Philosophical Society, 2008.

MLA (9th ed.) Citation

Willach, Rolf. The Long Route to the Invention of the Telescope. American Philosophical Society, 2008.