Gische, "New York City Banks," 21-67.
Harvey E. Fisk, "Fisk and Hatch, Bankers and Dealers in Government Securities, 1862-1885," Journal of Economic and Business History 2 (Aug. 1930): 707-8.
Fisk to Alexander Fisk, Sept. 11, 1883, in Letters of Harvey Fisk, ed. Harvey Edwin Fisk (New York, 1896).
Fisk and Hatch, Memoranda Concerning Government Bonds for the Information of Investors... 8th ed. (New York, 1881).
This is distilled from Fisk and Hatch, Memoranda Concerning Government Bonds for the Information of Investors. . . (New York, 1881, Eighth Edition).