| Sources  | 
- [S19]  1900 US Federal Census, (www.ancestry.com).
 
Name: William Cook Home in 1900: Washington, Bon Homme, South Dakota Age: 19 Birth Date: Sep 1870 Birthplace: South Dakota Race: White Ethnicity: American Gender: Male Relationship to Head of House: Son Father's Name: Christian Father's Birthplace: Russia Mother's Name: Anna Mother's Birthplace: Russia Marital Status: Single Residence : Scotland City, Bon Homme, South Dakota 
 
  
- [S30]  1910 US Federal Census, (www.ancestry.com). 
 
  
- [S24]  1920 US Federal Census, (www.ancestry.com). 
 
  
- [S25]  1930 US Federal Census, (www.ancestry.com). 
 
  
- [S891]  World War I Draft Registration Cards, 1917 - 1918, (www.ancestry.com).
 
Name: William Fred Kuk County: Bon Homme State: South Dakota Birth Date: 9 Sep 1881 Race: White FHL Roll Number: 1877786 DraftBoard: 0 
 
  
- [S366]  South Dakota Births, 1856-1903.
 
Name: William Fredrick Kuk Birth Date: 9 Sep 1881 Gender: Male County: Bon Homme Father's Name: Christian Kuk Mother's Name: Annie Mary Becker File Date: 14 Feb 1944 
 
  
- [S285]  South Dakota Death Index, 1905-1955.
 
Name: William Kuk Certificate Number: 262892 Death Day: 6 Death Month: Nov Death Year: 1951 County: Bon Homme Page Number: 405 
 
  
- [S558]  South Dakota Marriages, 1905-1949.
 
Name: William F Kuk Age: 60 Gender: Male Spouse: Katie Wentz Marriage Date: 14 Jul 1944 Marriage County: Bon Homme County of Residence: Bon Homme Post Office: Scotland 
  
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