Note: There are two papers James, W. (1884) and Lange, C. G. (1885) for this theory.

James, W., 1884

• https://www.jstor.org/stable/2246769

James, W. (1884). What is an Emotion? *Mind*, *9*(34), 188–205. <http://www.jstor.org/stable/2246769>

Lange, C. G., 1885

• Google Scholar

Lange, Carl Georg. "The mechanism of the emotions." The classical psychologists (1885): 672-684.

Summarized & quoted definition can be found at Schachter-Singer Theory (Schachter, S. & Singer, J. E., 1962) Exact Definition & APA Citation ’s paper.

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