APA (7th ed.) Citation

Glenn, J., & Glenn, J. J. (1964). Letters to John Glenn. World Book Encyclopedia Science Service.

Chicago Style (17th ed.) Citation

Glenn, John, and John Jr Glenn. Letters to John Glenn. Houston, Tex: World Book Encyclopedia Science Service, 1964.

MLA (9th ed.) Citation

Glenn, John, and John Jr Glenn. Letters to John Glenn. World Book Encyclopedia Science Service, 1964.

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