APA
Grosvenor G. H., National Geographic Society & A. Hoen & Co. (Baltimore). (1940). Europe and the near East. Washington: The National Geographic Society.
Chicago
Grosvenor Gilbert Hovey, National Geographic Society and A. Hoen & Co. (Baltimore). 1940. Europe and the near East. Washington: The National Geographic Society.
Harvard
Grosvenor G. H., National Geographic Society and A. Hoen & Co. (Baltimore). (1940). Europe and the near East. Washington: The National Geographic Society.
MLA
Grosvenor Gilbert Hovey, National Geographic Society and A. Hoen & Co. (Baltimore). Europe and the near East. Washington: The National Geographic Society. 1940.