I am writing a paper in an area where the concept of Return on Investment may not be clear. Is there a definitive source for its definition I can cite?
Any textbook on corporate finance contains the formula for ROI. Below are two popular ones,
Berk and De Marzo - Corporate Finance
Bodie, Kane, Marcus - Investments
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$\begingroup$ Is there a book with a freely downloadable pdf? $\endgroup$ – Tim Mak May 6 '20 at 9:19
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$\begingroup$ i found the pdf for both free. try different search engines $\endgroup$ – develarist May 6 '20 at 11:52