Crossley, H. E. (1936). "Diphenylcarbazide. An internal indicator for use in the titration of iron with dichromate". The Analyst61 (720): 164. doi:10.1039/AN9366100164. Bibcode: 1936Ana....61..164C.
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Crossley, H. E. (1936). "Diphenylcarbazide. An internal indicator for use in the titration of iron with dichromate". The Analyst61 (720): 164. doi:10.1039/AN9366100164. Bibcode: 1936Ana....61..164C.