Galvante, W. P., Magalong, M. M., & Mencias, C. F. A content analysis of Environmental Science I.
Lua i Stíl Chicago (17ú heag.)Galvante, Wulfilda P., Milagrosa M. Magalong, agus Cristina F. Mencias. A Content Analysis of Environmental Science I. Quezon City, 1974.
Lua MLA (9ú heag.)Galvante, Wulfilda P., et al. A Content Analysis of Environmental Science I.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.