This primary source comes from the Records of the National Aeronautics and Space Administration.
Full Citation: 'Soft-Landing Spacecraft is Planned' Marshall Star, Volume 1, Number 22; 2/1/1961; Marshall Star Newsletter Volume 1, 1960 - 2006; Marshall Star, 1960 - 2006; Records of the National Aeronautics and Space Administration, Record Group 255; National Archives at Atlanta, Morrow, GA. [Online Version, https://www.docsteach.org/documents/document/softlanding-spacecraft-marshall-star, April 29, 2024]