Felix, A. (1989). Mang Pedro de Leon: Herbolario. Historical Conservation Society.
Lua i Stíl Chicago (17ú heag.)Felix, Alfonso. Mang Pedro De Leon: Herbolario. Manila: Historical Conservation Society, 1989.
Lua MLA (9ú heag.)Felix, Alfonso. Mang Pedro De Leon: Herbolario. Historical Conservation Society, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.