De la Cruz, L. d. D., Abellera, T. P., & Bilasano, J. B. (1972). Basic study skills: A workbook-textbook. Social Studies Publications.
Lua i Stíl Chicago (17ú heag.)De la Cruz, Leonardo de Dios, Tomas P. Abellera, agus Jose B. Bilasano. Basic Study Skills: A Workbook-textbook. Manila: Social Studies Publications, 1972.
Lua MLA (9ú heag.)De la Cruz, Leonardo de Dios, et al. Basic Study Skills: A Workbook-textbook. Social Studies Publications, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.