Gathercoal, E. N. (1933). The prescription ingredient survey: Consisting of th Ebert survey of 1885, the Hallberg survey of 1895, the Hallberg-Snow survey of 1807, the Charters survey of 1926, the Cook survey of 1930, the Gathercoal survey of 1930, the U.S.P.N.F. survey of 1931-32. American pharmaceutical association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGathercoal, Edmund Norris. The Prescription Ingredient Survey: Consisting of Th Ebert Survey of 1885, the Hallberg Survey of 1895, the Hallberg-Snow Survey of 1807, the Charters Survey of 1926, the Cook Survey of 1930, the Gathercoal Survey of 1930, the U.S.P.N.F. Survey of 1931-32. [Chicago?]: American pharmaceutical association, 1933.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGathercoal, Edmund Norris. The Prescription Ingredient Survey: Consisting of Th Ebert Survey of 1885, the Hallberg Survey of 1895, the Hallberg-Snow Survey of 1807, the Charters Survey of 1926, the Cook Survey of 1930, the Gathercoal Survey of 1930, the U.S.P.N.F. Survey of 1931-32. American pharmaceutical association, 1933.