APA-referens (7:e uppl.)

De Castro, N. M. L., De los Angeles, P. E. Y., & Ugaddan, M. I. (2019). Pretend play of children in the U.P. Child Development Center. College of Home Economics, University of the Philippines Diliman.

Chicago-referens (17:e uppl.)

De Castro, Nica Mae L., Paulina Enrica Y. De los Angeles, och Miriam I. Ugaddan. Pretend Play of Children in the U.P. Child Development Center. Quezon City: College of Home Economics, University of the Philippines Diliman, 2019.

MLA-referens (9:e uppl.)

De Castro, Nica Mae L., et al. Pretend Play of Children in the U.P. Child Development Center. College of Home Economics, University of the Philippines Diliman, 2019.