APA

Gitman L. J., Robana A. & Biggs W. D. (1981). Portstrat. New York, NY [u.a.]: Wiley.

Chicago

Gitman Lawrence J, Robana Abderrahman and Biggs William D. 1981. Portstrat. New York, NY [u.a.]: Wiley.

Harvard

Gitman L. J., Robana A. and Biggs W. D. (1981). Portstrat. New York, NY [u.a.]: Wiley.

MLA

Gitman Lawrence J, Robana Abderrahman and Biggs William D. Portstrat. New York, NY [u.a.]: Wiley. 1981.