Espiritu, L. C. (2018). Tik-tak, tik-tak. Save the Children Philippines, Sentro ng Wikang Filipino-UP Diliman.
Chicago Style (17. basım) AtıfEspiritu, Laarni C. Tik-tak, Tik-tak. Quezon City: Save the Children Philippines, Sentro ng Wikang Filipino-UP Diliman, 2018.
MLA (9th ed.) AtıfEspiritu, Laarni C. Tik-tak, Tik-tak. Save the Children Philippines, Sentro ng Wikang Filipino-UP Diliman, 2018.
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