APA Citation
Goddard, Robert Hutchings,. Robert H. Goddard letter to Martin Sheridan, dated Mescalero Ranch, Post Office Box 978, Roswell, New Mexico, 29 September 1938. Retrieved from https://library.si.edu/digital-library/book/roberthgoddardl00goddc
MLA Citation
Goddard, Robert Hutchings,. Robert H. Goddard letter to Martin Sheridan, dated Mescalero Ranch, Post Office Box 978, Roswell, New Mexico, 29 September 1938. https://library.si.edu/digital-library/book/roberthgoddardl00goddc
Chicago
Goddard, Robert Hutchings,. Robert H. Goddard letter to Martin Sheridan, dated Mescalero Ranch, Post Office Box 978, Roswell, New Mexico, 29 September 1938. https://library.si.edu/digital-library/book/roberthgoddardl00goddc
Warning: These citations may not always be complete (especially for serials).