Tomecek, S., & Harper, F. (2015). Dirtmeister's nitty gritty planet Earth: All about rocks, minerals, fossils, earthquakes, volcanoes, & even dirt! National Geographic Kids.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Tomecek, Steve, و Fred Harper. Dirtmeister's Nitty Gritty Planet Earth: All About Rocks, Minerals, Fossils, Earthquakes, Volcanoes, & Even Dirt! Washington, D.C.: National Geographic Kids, 2015.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Tomecek, Steve, و Fred Harper. Dirtmeister's Nitty Gritty Planet Earth: All About Rocks, Minerals, Fossils, Earthquakes, Volcanoes, & Even Dirt! National Geographic Kids, 2015.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.