APA (7th ed.) Citation

GLENN, J. (1964). Letters to John Glenn. World Book Encyclopedia Science, Inc.

Chicago Style (17th ed.) Citation

GLENN, John. Letters to John Glenn. World Book Encyclopedia Science, Inc, 1964.

MLA (8th ed.) Citation

GLENN, John. Letters to John Glenn. World Book Encyclopedia Science, Inc, 1964.

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