APA (7th ed.) Citation

Hansen, T., & Hansen, J. (2007). State boundaries of America: How, why and when American state lines were formed. Heritage Books.

Chicago Style (17th ed.) Citation

Hansen, Tegan, and Jerry Hansen. State Boundaries of America: How, Why and When American State Lines Were Formed. Westminster, Md: Heritage Books, 2007.

MLA (9th ed.) Citation

Hansen, Tegan, and Jerry Hansen. State Boundaries of America: How, Why and When American State Lines Were Formed. Heritage Books, 2007.