APA

Brock L. A., . (1974). How to communicate by letter and memo. : McGraw Hill: N.Y.

Chicago

Brock Luther A, . 1974. How to communicate by letter and memo. : McGraw Hill: N.Y.

Harvard

Brock L. A., . (1974). How to communicate by letter and memo. : McGraw Hill: N.Y.

MLA

Brock Luther A, . How to communicate by letter and memo. : McGraw Hill: N.Y. 1974.