APA (7th ed.) Citation

Multhauf, R. P., & Lenzen, V. F. (2011). Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966. Project Gutenberg.

Chicago Style (17th ed.) Citation

Multhauf, Robert P., and Victor Fritz Lenzen. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Multhauf, Robert P., and Victor Fritz Lenzen. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966. Project Gutenberg, 2011.

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