APA Style

Covey, S, R. (1997). The seven habits of highly effective people : restoring the character ethic / Stephen R. Covey . London: Simon & Schuster.

MLA Style

Covey, Stephen, R.. "The seven habits of highly effective people : restoring the character ethic / Stephen R. Covey". London: Simon & Schuster, 1997. หนังสือ (Book).