History of northern Wisconsin: containing an account of its settlement, growth, development, and resources, an extensive sketch of its counties, cities, towns and villages, their improvements, industries, manufactories, biographical sketches, portraits of prominent men and early settlers, views of county seats, etc. Chicago: Western Historical Co., 1881. p.1153

Christian Look, wholesale and retail dealer, and manufacturer of cigars; manufactures 300,000 per annum; employs eight hands; established in Berlin, Wis., in 1870; was there until 1875; he then came to Oshkosh and began business. He learned his trade in New York City in 1866-67; he was born in Hanover, Germany, June 17, 1847; emigrated to America in 1866 and lived in New York City eighteen months; then to Sheboygan and worked until 1870 at cigar making. Was married near Oshkosh in 1870 to Miss Henrietta Kobs, who was born in Prussia Oct. 31, 1851; they have four children- Nettie, Emma, Else and Martha.