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sylas said:The instructor also recommends as excellent reading on this subject: G. Greenstein and A.G. Zajonc, “The Quantum Challenge” (Jones and Bartlett Publishers, 2005).
This is the same reference I gave in post #51. The reference states that quantization of the electromagnetic field is not necessary to explain the photoelectric effect (there's a caveat to this, but it's not relevant at this point).