(Jagor's Travels in the Philippines; Comyn's State of the Philippines
in 1810; Wilkes' Manila and Sulu in 1842; White's Manila in 1819;
Virchow's Peopling of the Philippines; 1778 and 1878; English Views
of the People and Prospects of the Philippines; and Karuth's Filipino
Merchants of the Early 1890s)