Scheerer, O. (1924). On the essential difference between the verbs of the European and the Philippine languages. Manila.
Chicago-referens (17:e uppl.)Scheerer, Otto. On the Essential Difference Between the Verbs of the European and the Philippine Languages. Bureau of Science of the Philippine Government: Manila, 1924.
MLA-referens (9:e uppl.)Scheerer, Otto. On the Essential Difference Between the Verbs of the European and the Philippine Languages. Manila, 1924.
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