Rotary Club of Manila. Southern frontier-Mindanao. s.n.
Cita Chicago (17th ed.)Rotary Club of Manila. Southern Frontier-Mindanao. [S.l: s.n.
Cita MLA (9th ed.)Rotary Club of Manila. Southern Frontier-Mindanao. s.n.
Atenció: Aquestes cites poden no estar 100% correctes.