APA
Silberg J., . (2004). The Learning Power of Laughter. Beltsville: Grypon House.
Chicago
Silberg Jackie, . 2004. The Learning Power of Laughter. Beltsville: Grypon House.
Harvard
Silberg J., . (2004). The Learning Power of Laughter. Beltsville: Grypon House.
MLA
Silberg Jackie, . The Learning Power of Laughter. Beltsville: Grypon House. 2004.
