APA

Hoel P. G., . (1971). Introduction to probability theory. New York: Houghton Mifflin.

Chicago

Hoel Paul Gerhard, . 1971. Introduction to probability theory. New York: Houghton Mifflin.

Harvard

Hoel P. G., . (1971). Introduction to probability theory. New York: Houghton Mifflin.

MLA

Hoel Paul Gerhard, . Introduction to probability theory. New York: Houghton Mifflin. 1971.