Williamson, G. K. (1991). The Dearborn investment companion: A worldwide guide to investment performance (2nd ed.). Dearborn Financial Pub.
Cita Chicago (17th ed.)Williamson, Gordon K. The Dearborn Investment Companion: A Worldwide Guide to Investment Performance. 2nd ed. Chicago, Ill: Dearborn Financial Pub, 1991.
Cita MLA (9th ed.)Williamson, Gordon K. The Dearborn Investment Companion: A Worldwide Guide to Investment Performance. 2nd ed. Dearborn Financial Pub, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.