Commonwealth Act No. 625: An Act Providing the Manner in Which the Option to Elect Philippine Citizenship Shall be Declared by a Person Whose Mother is a Filipino Citizen

The option to elect Philippine citizenship in accordance with subsection (4), Section 1, Article IV, of the Constitution shall be expressed in a statement to be signed and sworn to by the party concerned before any officer authorized to administer oaths, and shall be filed with the nearest civil registry. The said party shall accompany the aforesaid statement with the oath of allegiance to the Constitution and the Government of the Philippines.

Commonwealth Act No. 613: The Philippine Immigration Act of 1940

A Bureau of Immigration [now Commission on Immigration and Deportation] is established under a Commissioner of Immigration, who shall have two assistants, a First Deputy Commissioner of Immigration [now Associate Commissioner of Immigration] and a Second Deputy Commissioner of Immigration [now Associate Commissioner of Immigration]. For administrative purposes, the Bureau of Immigration [now Commission on Immigration and Deportation] shall be under the supervision and control of the Department of Labor [now Department of Justice] or of any other executive department which the President may subsequently determine.