JESSEN, R. J. (1978). Statistical survey techniques. John Wiley.
Cita Chicago (17th ed.)JESSEN, Raymond James. Statistical Survey Techniques. New York: John Wiley, 1978.
Cita MLA (9th ed.)JESSEN, Raymond James. Statistical Survey Techniques. John Wiley, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.