Redigerer Hughes Hercules H-4 (avsnitt)

==Litteratur==
* Francillon, René J. ''McDonnell Douglas Aircraft since 1920: Volume II''. Annapolis, Maryland: Naval Institute Press, 1990. {{ISBN|1-55750-550-0}}.
* McDonald, John J. ''Howard Hughes and the Spruce Goose''. Blue Ridge Summit, Pennsylvania: Tab Books Inc., 1981. {{ISBN|0-8306-2320-5}}.
* Odekirk, Glenn E. ''Spruce Goose'' (Title inside cover: ''HK-1 Hercules: A Pictorial History of the Fantastic Hughes Flying Boat''). Long Beach, California: Glenn E. Odekirk and Frank Alcantr, Inc., 1982. No ISBN.
* Parker, Dana T. ''Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II,'' Cypress, CA, 2013. {{ISBN|978-0-9897906-0-4}}.
* Winchester, Jim. "Hughes H-4 'Spruce Goose'." ''Concept Aircraft: Prototypes, X-Planes and Experimental Aircraft''. Kent, UK: Grange Books plc., 2005. {{ISBN|978-1-59223-480-6}}.
* David, Peter. ''The Rocketeer: The Official Movie Adaptation''. Burbank, California: W D Publications Inc., 1991. {{ISBN|1-56115-190-4}}.
* Schwartz, Milton L.''The Spruce Goose Commemorative Pictorial''. Oakland, California: The Wrather Corporation by Mike Roberts Color Productions, 1983.
* Yenne, Bill. ''Seaplanes & Flying Boats: A Timeless Collection from Aviation's Golden Age''. New York: BCL Press, 2003. {{ISBN|1-932302-03-4}}.
* [https://web.archive.org/web/20130602163259/http://www.popsci.com/archive-viewer?id=MSEDAAAAMBAJ&pg=94&query=June+1945 "Look Inside The World's Largest Plane"] - ''[[Popular Science]]'', September 1945
* [https://books.google.com/books?id=LiEDAAAAMBAJ&pg=RA2-PA28&dq=Popular+Science+1946+motor+gun+boat&hl=en&ei=qHPrTIP_CemQnwforuySAg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC8Q6AEwAA#v=onepage&q&f=true "World's Largest Airplane Takes To The Road"] - ''Popular Science'', August 1946
* [https://books.google.com/books?id=QtkDAAAAMBAJ&pg=PA124&dq=flying++boat&hl=en&ei=Q894TOGLJI-jnQfG6KmdCw&sa=X&oi=book_result&ct=result&resnum=2&ved=0CDcQ6AEwAQ#v=onepage&q=flying%20%20boat&f=true "200 tons and it flies!"] - [[''Popular Mechanics'']], January 1948