APA

Flesch R. F., . (1949). The art of readable writing. New York: Harper.

Chicago

Flesch Rudolf Franz, . 1949. The art of readable writing. New York: Harper.

Harvard

Flesch R. F., . (1949). The art of readable writing. New York: Harper.

MLA

Flesch Rudolf Franz, . The art of readable writing. New York: Harper. 1949.