Guthrie, G. M. (1968). Six perspectives on the Philippines. Bookmark.
Lua i Stíl Chicago (17ú heag.)Guthrie, George M. Six Perspectives on the Philippines. Manila: Bookmark, 1968.
Lua MLA (8ú heag.)Guthrie, George M. Six Perspectives on the Philippines. Bookmark, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.