APA Style

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

MLA Style

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