Final answer:
The Green Book is the reference that provides information on FDA-approved drugs for animals, essential for veterinarians and pharmacists.
Step-by-step explanation:
The reference that could provide information on approved animal drug products would be the Green Book. The Green Book is published by the U.S. Food and Drug Administration's Center for Veterinary Medicine and contains information about FDA-approved drugs for animals. This publication is crucial for veterinarians and pharmacists who wish to ensure that prescriptions for animals comply with regulatory standards.