Hirsch, R. E. (2018). The monarchs are missing: A butterfly mystery. Millbrook Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHirsch, Rebecca E. The Monarchs Are Missing: A Butterfly Mystery. Minneapolis: Millbrook Press, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHirsch, Rebecca E. The Monarchs Are Missing: A Butterfly Mystery. Millbrook Press, 2018.
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