Final answer:
The most appropriate source for Donovan to use in his research on the impact of religious beliefs of ancient Egyptians on the design of their temples would be historical texts, archaeological findings, and scholarly articles on ancient Egyptian religion and temple architecture.
Step-by-step explanation:
The most appropriate source for Donovan to use in his research on the impact of religious beliefs of ancient Egyptians on the design of their temples would be historical texts, archaeological findings, and scholarly articles on ancient Egyptian religion and temple architecture. These sources provide factual and detailed information about the religious beliefs and practices of ancient Egyptians, as well as the architectural features and symbolism incorporated into their temple designs. A comprehensive understanding can be gained by examining primary sources such as religious texts, inscriptions, and temple remnants, as well as secondary sources written by experts in the field.