APA Style

Blair, E, H., Robertson, J, A. (1973). The Philippine Islands 1493-1898 volume XIX-XXI (volume XIX-XXI). Mandaluyong: Cachos Hermanos, Inc.

MLA Style

Blair, Emma, Helen., Robertson, James, Alexander. "The Philippine Islands 1493-1898 volume XIX-XXI". volume XIX-XXI Mandaluyong: Cachos Hermanos, Inc, 1973. Buku.