Padilla, G. B. (1977). A correlation between the liquid limit and the fall-cone penetration [microform]. Photoduplication Service. University of the Philippines Library.
Citação norma ChicagoPadilla, George B. A Correlation Between the Liquid Limit and the Fall-cone Penetration [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
Citação norma MLAPadilla, George B. A Correlation Between the Liquid Limit and the Fall-cone Penetration [microform]. Photoduplication Service. University of the Philippines Library, 1977.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.