Pflugfelder, B., Hockensmith, S., & Garrett, S. (2014). Nick and Tesla's secret agent gadget battle: A mystery with spy cameras, code wheels, and other gadgets you can build yourself. Quirk Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPflugfelder, Bob, Steve Hockensmith, और Scott Garrett. Nick and Tesla's Secret Agent Gadget Battle: A Mystery with Spy Cameras, Code Wheels, and Other Gadgets You Can Build Yourself. Philadelphia: Quirk Books, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPflugfelder, Bob, et al. Nick and Tesla's Secret Agent Gadget Battle: A Mystery with Spy Cameras, Code Wheels, and Other Gadgets You Can Build Yourself. Quirk Books, 2014.
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