Albert Einstein. On the method of theoretical physics [J]. Philosophy of Science, 1934, 1(2): 163-169.

https://www.jstor.org/stable/184387

https://www.stmarys-ca.edu/sites/default/files/attachments/files/On_The_Method_of_Theoretical_Physics.pdf

JOURNAL ARTICLE
On the Method of Theoretical Physics
Albert Einstein
Philosophy of Science
Vol. 1, No. 2 (Apr., 1934), pp. 163-169 (7 pages)
Published By: The University of Chicago Press