Pevsner, N. The Term «Architect» in the Middle Ages // Speculum. № 17. 1942. P. 549–562.
Phillips, E. W. J. The Occurrence of Compression Wood in African Pencil Cedar // Empire Forestry Journal. № 16. 1937. P. 54–57.
Pichirallo, Joe. Lead Poisoning: Risks for Pencil Chewers? // Science. № 173. Aug. 6, 1971. P. 509–510.
Pigot and Company. London and Provincial New Commercial Directory, for 1827–28; Comprising a Classification of, and Alphabetical Reference to the Merchants, Manufacturers and Traders of the Metropolis, [etc.]. 3rd ed. London, [1827].
Pigot and Company. Metropolitan New Alphabetical Directory, for 1827; [etc.]. London, [1827].
Pinck, Dan. Paging Mr. Ross // Encounter. № 69. June 1987. P. 5–11.
Pliny. Natural History. With an English translation by H. Rackham. Cambridge, Mass., 1979.
Plot, Rob. Some Observations Concerning the Substance Commonly Called, Black Lead // Philosophical Transactions (London). № 20. 1698. P. 183.
Porter, Terry. The Pencil Revolution // Texas Instruments Engineering Journal. № 2. Jan. — Feb. 1985. P. 66.
Pratt, Joseph Hyde. The Graphite Industry // Mining World. July 22, 1905. P. 64–66.
Pratt, Sir Roger. The Architecture of Sir Roger Pratt, [etc.]. Edited by R. T. Gunther. Oxford, 1928.
Pye, David. The Nature and Aesthetics of Design. London, 1978.
Rance, H. F., editor. Structure and Physical Properties of Paper. NY, 1982.
Reed, George H. The History and Making of the Lead Pencil // Popular Educator. № 41. June 1924. P. 580–582.
Rees, Abraham. The Cyclopedia; or, Universal Dictionary of Arts, Sciences, and Literature. Philadelphia, n.d.
Rehman, M. A., and S. M. Ishaq. Indian Woods for Pencil Making // Indian Forest Research Leaflet. № 66. 1945.
Rehman, M. A., and Jai Kishen. Chemical Staining of Deodar Pencil Slats // Indian Forester. № 79. Sept. 1953. P. 512–513.
Rehman, M. A., and Jai Kishen. Treatment of Indian Timbers for Pencils and Hand Tools for Pencil Making // Indian Forest Leaflet. № 126. 1952.
Rehman, M. A., and Jai Kishen. Deodar as Pencil Wood // Indian Forest Bulletin. № 149. [ca. 1953].
Remington, Frank L. The Formidable Lead Pencil // Think. Nov. 1957. P. 24–26. [В сокращенном варианте: The Versatile Lead Pencil // Science Digest. № 43. Apr. 1958. P. 38–41.]
Rennie, John. The Autobiography of Sir John Rennie, F.R.S., [etc.]. London, 1875.
Rexel Limited. Making Pens and Pencils: A Story of Tradition. [Illustrated folder.] Aylesbury, Bucks., n.d.
Richards, Gregory B. Bright Outlook for Writing Instruments // Office Products Dealer. June 1983. P. 40, 42, 44, 48.