Hammershark Media. (2004). Twenty trucks: Can you name twenty trucks? I bet you can! Hammershark Media.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHammershark Media. Twenty Trucks: Can You Name Twenty Trucks? I Bet You Can! [S.l.]: Hammershark Media, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHammershark Media. Twenty Trucks: Can You Name Twenty Trucks? I Bet You Can! Hammershark Media, 2004.
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