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For a solid approach to the complexity of Planck's intellectual motivations for the quantum, for his reluctant acceptance of its implications, see H. Kragh, Max Planck: the reluctant revolutionaryArchived 2012-04-01 at the Wayback Machine, Physics World. December 2000.
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Einstein, A. (1967). "On a heuristic viewpoint concerning the production and transformation of light". In Ter Haar, D. (ed.). The Old Quantum Theory. Pergamon. pp. 91–107. OCLC534625. The chapter is an English translation of Einstein's 1905 paper on the photoelectric effect.