Pena, A. D. (1972). An analysis of the distribution of GIA projects 1966-70.
Lua i Stíl Chicago (17ú heag.)Pena, Alberto D. An Analysis of the Distribution of GIA Projects 1966-70. Quezon City, 1972.
Lua MLA (9ú heag.)Pena, Alberto D. An Analysis of the Distribution of GIA Projects 1966-70. 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.