MLA

Strunk, William, and Elwyn Brooks White. The Elements of Style : with Revisions, an Introduction and a Chapter On Writing. 3rd ed. New York (N.Y.): Macmillan reference, 1979.

APA

Strunk, W., & White, E. Brooks. (1979). The elements of style : with revisions, an introduction and a chapter on writing. 3rd ed. New York (N.Y.): Macmillan reference.

Chicago

Strunk, William, and Elwyn Brooks White. The Elements of Style: With Revisions, an Introduction and a Chapter On Writing. 3rd ed. New York (N.Y.): Macmillan reference, 1979.