National Historical Commission of the Philippines, Wionzek, K., & Schult, V. (2022). Ferdinand Blumentritt's Carta memoria of 1899 : a plan for an American protectorate in the Philippines: Evidence of his participation in the building of a new nation. National Historical Commission of the Philippines.

National Historical Commission of the Philippines, Karl-Heinz Wionzek, and Volker Schult. Ferdinand Blumentritt's Carta Memoria of 1899 : A Plan for an American Protectorate in the Philippines: Evidence of His Participation in the Building of a New Nation. Manila: National Historical Commission of the Philippines, 2022.

National Historical Commission of the Philippines, et al. Ferdinand Blumentritt's Carta Memoria of 1899 : A Plan for an American Protectorate in the Philippines: Evidence of His Participation in the Building of a New Nation. National Historical Commission of the Philippines, 2022.