Wernstedt, F. L., & Spencer, J. E. (1967). The Philippine Island world: A physical, cultural and regional geography. Berkeley, CA: University of California Press.
Παραπομπή Chicago StyleWernstedt, Frederickl L., and J. E. Spencer. The Philippine Island World: A Physical, Cultural and Regional Geography. Berkeley, CA: University of California Press, 1967.
Παραπομπή MLAWernstedt, Frederickl L., and J. E. Spencer. The Philippine Island World: A Physical, Cultural and Regional Geography. Berkeley, CA: University of California Press, 1967.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.