Bulatao, J. (1966). The finger abacus. Ateneo de Manila University, Publications Office.
Lua i Stíl Chicago (17ú heag.)Bulatao, Jaime. The Finger Abacus. Quezon City: Ateneo de Manila University, Publications Office, 1966.
Lua MLA (9ú heag.)Bulatao, Jaime. The Finger Abacus. Ateneo de Manila University, Publications Office, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.