Nannetti, G. (1960). Ang abakada ng lupa = Alphabet of the soil. United Nations Educational and Scientific Organization; (Manila) : Bureau of Printing.
Citace podle Chicago (17th ed.)Nannetti, Guillermo. Ang Abakada Ng Lupa = Alphabet of the Soil. [Manila: United Nations Educational and Scientific Organization; (Manila) : Bureau of Printing, 1960.
Citace podle MLA (9th ed.)Nannetti, Guillermo. Ang Abakada Ng Lupa = Alphabet of the Soil. United Nations Educational and Scientific Organization; (Manila) : Bureau of Printing, 1960.
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