Lepp Friesen, H. (2019). Water Quality. Smartbook Media Inc.
https://learn.openlightbox.com/TASubscription/92fe5023-7012-4c62-a2bf-77a2d5dd0963/9081e918-aca7-4d85-8f61-2ac49ebd27ee/5/57
The Chicago Manual of Style (Chicago)
Lepp Friesen, Helen. Water Quality. Earth’s Precious Water. New York: Smartbook Media Inc., 2019,
https://learn.openlightbox.com/TASubscription/92fe5023-7012-4c62-a2bf-77a2d5dd0963/9081e918-aca7-4d85-8f61-2ac49ebd27ee/5/57. Accessed
28 Jun. 2025.
The Modern Language Association of America (MLA)
Lepp Friesen, Helen. Water Quality. Smartbook Media Inc., 2019. Earth’s Precious Water. Lightbox Nonfiction Subscription,
https://learn.openlightbox.com/TASubscription/92fe5023-7012-4c62-a2bf-77a2d5dd0963/9081e918-aca7-4d85-8f61-2ac49ebd27ee/5/57.
