Tomecek, S., & Harper, F. (2015). Dirtmeister's nitty gritty planet Earth: All about rocks, minerals, fossils, earthquakes, volcanoes, & even dirt! National Geographic Kids.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTomecek, Steve, और Fred Harper. Dirtmeister's Nitty Gritty Planet Earth: All About Rocks, Minerals, Fossils, Earthquakes, Volcanoes, & Even Dirt! Washington, D.C.: National Geographic Kids, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTomecek, Steve, और Fred Harper. Dirtmeister's Nitty Gritty Planet Earth: All About Rocks, Minerals, Fossils, Earthquakes, Volcanoes, & Even Dirt! National Geographic Kids, 2015.
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