John, H., & Helen, S. (2019). Life 6 (Second edition.). Massachusetts, Estados Unidos: National Geographic Learning.
Chicago Style CitationJohn, Hughes,, and Stephenson Helen. Life 6. Second edition. Massachusetts, Estados Unidos: National Geographic Learning, 2019.
MLA CitationJohn, Hughes,, and Stephenson Helen. Life 6. Second edition. Massachusetts, Estados Unidos: National Geographic Learning, 2019.
Warning: These citations may not always be 100% accurate.