"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MDZQ-FC7 : accessed 06 Aug 2014), John W Hook in household of Z Hook, Callaway county, Callaway, Missouri, United States; citing family 564, NARA microfilm publication M432.
"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MHZ3-Q12 : accessed 06 Aug 2014), John W Hook in household of Zadok Hook, Round Prairie Township, Callaway, Missouri, United States; citing "1860 U.S. Federal Census - Population," Fold3.com; p. 80, household ID 547, NARA microfilm publication M653; FHL microfilm 803610.
"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M4XZ-2MM : accessed 06 Aug 2014), Zadok Hook, Missouri, United States; citing p. 8, family 41, NARA microfilm publication M593, FHL microfilm 000552263.