Villanueva, M. C. C., & Espina, M. A. A. (1999). Likas Lingap: Landscape development of highways along lahar-devastated areas.
Lua i Stíl Chicago (17ú heag.)Villanueva, Mary Claire C., agus Mary Ann A. Espina. Likas Lingap: Landscape Development of Highways Along Lahar-devastated Areas. 1999.
Lua MLA (9ú heag.)Villanueva, Mary Claire C., agus Mary Ann A. Espina. Likas Lingap: Landscape Development of Highways Along Lahar-devastated Areas. 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.