Reference
- Phase Contrast Microscope Accessories , 2 Rochester, New York : Bausch and Lomb Optical Company . Cat. No. 31-58-78-01, Reference Manual
- Crossman , G. 1959 . The Value of Phase Microscopy for the Examination of Participate Matter Collected on Membrane Filters. . Amer. Ind. Hyg. Assoc. J. , 20 June : 190
- Crossman , G. 1957 . Dispersion Staining Microscopy as Applied to Industrial Hygiene. . Amer. Ind. Hyg. Assoc. Quart. , 18 Dec : 341