Butz, S. D., & Stephen D. Butz. (2008). Science of earth systems: Spanish Vocabulary and Summaries Student Workbook. Clifton Park, NY: Thomson Delmar Learning.
शिकागो स्टाइल उद्धरणButz, Stephen D., और Stephen D. Butz. Science of Earth Systems: Spanish Vocabulary and Summaries Student Workbook. Clifton Park, NY: Thomson Delmar Learning, 2008.
एमएलए उद्धरणButz, Stephen D., और Stephen D. Butz. Science of Earth Systems: Spanish Vocabulary and Summaries Student Workbook. Clifton Park, NY: Thomson Delmar Learning, 2008.
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