Cita APA (7a ed.)

Henkes, K., & Lobel, A. (2005). So happy! Greenwillow Books.

Cita Chicago Style (17a ed.)

Henkes, Kevin, y Anita Lobel. So Happy! [New York]: Greenwillow Books, 2005.

Cita MLA (8a ed.)

Henkes, Kevin, y Anita Lobel. So Happy! Greenwillow Books, 2005.