APA استشهاد

Flesch, R. (1973). The art of clear thinking. Barnes & Noble Books.

استشهاد بنمط شيكاغو

Flesch, Rudolf. The Art of Clear Thinking. New York: Barnes & Noble Books, 1973.

MLA استشهاد

Flesch, Rudolf. The Art of Clear Thinking. Barnes & Noble Books, 1973.