APA استشهاد

Okawa, R. A. (2009). The laws of happiness: Four principles for a successful life.

استشهاد بنمط شيكاغو

Okawa, Ryuho; Author. The Laws of Happiness: Four Principles for a Successful Life. Mumbai, Jaico Publishing House, 2009.

MLA استشهاد

Okawa, Ryuho; Author. The Laws of Happiness: Four Principles for a Successful Life. 2009.