Petersen, A. 1875. Kommunistiske Samfund i Nordamerikas Forenede Stater. The communistic societies of the United States; from personal visit and observation: including detailed accounts of the Economists, Zoarites, the Amana, Oneida, Bethel, Aurora, Icarian, and other existing societies, their religious creeds, social practices, numbers, industries aud present condition. By Charles Nordhoff. With illustrations. John Murray. 1875. Nationaløkonomisk Tidsskrift. 5, (jan. 1875).