Engber, Martha (April 14, 1991). "The Moon, and Back". Chicago Tribune. p.18-1. Archived from the original on February 4, 2022. Retrieved December 28, 2019– via Newspapers.com.
Engber, Martha (April 14, 1991). "The Moon, and Back". Chicago Tribune. p.18-1. Archived from the original on February 4, 2022. Retrieved December 28, 2019– via Newspapers.com.