Which of the following individuals did not author one of social psychology's first textbooks?

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Muzafer Sherif is renowned for his contributions to social psychology through experimental research and theory, particularly in areas like social norms and group conflict (e.g., the Robbers Cave experiment), rather than authoring one of the field's first textbooks. William McDougall, Edward Ross, and Floyd Allport each authored early and influential texts in social psychology.

Which of the Following Individuals Did Not Author One of Social