Harpen, N. H. v. (1930). De electrometrische bepaling van de waterstofionenconcentratie in de latex van Hevea Brasiliensis en hare toepassing op technische vraagstukken = the electrometric determination of the hydrogen ion concentration in the latex of Hevea Brasiliensis and its applicability to technical problems. Medan: Varekamp.
Chicago Style CitationHarpen, Nicolaas Hendrik van. De Electrometrische Bepaling Van De Waterstofionenconcentratie in De Latex Van Hevea Brasiliensis En Hare Toepassing Op Technische Vraagstukken = the Electrometric Determination of the Hydrogen Ion Concentration in the Latex of Hevea Brasiliensis and Its Applicability to Technical Problems. Medan: Varekamp, 1930.
MLA CitationHarpen, Nicolaas Hendrik van. De Electrometrische Bepaling Van De Waterstofionenconcentratie in De Latex Van Hevea Brasiliensis En Hare Toepassing Op Technische Vraagstukken = the Electrometric Determination of the Hydrogen Ion Concentration in the Latex of Hevea Brasiliensis and Its Applicability to Technical Problems. Medan: Varekamp, 1930.