Short-Wave World-Wide Radio ToursShort-Wave World-Wide Radio Tours. Radio Stations Map of the World Showing at a Glance Location, Call Letters and Frequency off Principal Short-Wave stations. RCA Cunningham Radiotron, 10¢

Chicago citation style
Hagstrom Company, Inc. Short-Wave World-Wide Radio Tours,Short-Wave World-Wide Radio Tours. Radio Stations Map of the World Showing at a Glance Location, Call Letters and Frequency off Principal Short-Wave stations. RCA Cunningham Radiotron, 10¢. 1933. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~277745~90050764. (Accessed December 16, 2018.)
APA citation style
Hagstrom Company, Inc, (1933) Short-Wave World-Wide Radio Tours,Short-Wave World-Wide Radio Tours. Radio Stations Map of the World Showing at a Glance Location, Call Letters and Frequency off Principal Short-Wave stations. RCA Cunningham Radiotron, 10¢. Retrieved from the Digital Public Library of America, https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~277745~90050764
MLA citation style
Hagstrom Company, Inc. Retrieved from the Digital Public Library of America <https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~277745~90050764>.
Note: These citations are programmatically generated and may be incomplete.