APA aipamena

Brown, S. J., Goetzmann, W. N., & Grinblatt, M. (1998). Positive portfolio factors. National Bureau of Economic Research.

Chicago Style aipamena

Brown, Stephen J., William N. Goetzmann, and Mark Grinblatt. Positive Portfolio Factors. Cambride: National Bureau of Economic Research, 1998.

MLA aipamena

Brown, Stephen J., et al. Positive Portfolio Factors. National Bureau of Economic Research, 1998.