Royama, M., Friend, T., & Takeuchi, T. 1. (1967). The Philippine polity: A Japanese view. Yale University, Southeast Asia Studies.
Lua i Stíl Chicago (17ú heag.)Royama, Masamichi, Theodore Friend, agus Tatsuji 1904 Takeuchi. The Philippine Polity: A Japanese View. [New Haven]: Yale University, Southeast Asia Studies, 1967.
Lua MLA (9ú heag.)Royama, Masamichi, et al. The Philippine Polity: A Japanese View. Yale University, Southeast Asia Studies, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.