Lua APA (7ú heag.)

Guballa, C. B. (2002). Purposeful play. Philippine Daily Inquirer.

Lua i Stíl Chicago (17ú heag.)

Guballa, Cathy Babao. "Purposeful Play." Philippine Daily Inquirer 2002.

Lua MLA (9ú heag.)

Guballa, Cathy Babao. "Purposeful Play." Philippine Daily Inquirer, 2002.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.