APA

Galvin T. J., . (1971). Current problems in reference service. New York: R. R. Bowker Co.

Chicago

Galvin Thomas J, . 1971. Current problems in reference service. New York: R. R. Bowker Co.

Harvard

Galvin T. J., . (1971). Current problems in reference service. New York: R. R. Bowker Co.

MLA

Galvin Thomas J, . Current problems in reference service. New York: R. R. Bowker Co. 1971.