Cole, F. (The) Wild tribes of davao district, Mindanao. S.N.
Chicago-viite (17. p.)Cole, Fay-Cooper. (The) Wild Tribes of Davao District, Mindanao. S.N.
MLA-viite (8. p.)Cole, Fay-Cooper. (The) Wild Tribes of Davao District, Mindanao. S.N.
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