Groves, R. M., Biemer, P. P., Lyeberg, L. E., Massey, J. T., Nicholls, W., & Waksberg, J. (1988). Telephone survey methodology. John Wiley.
Cita Chicago (17th ed.)Groves, Robert M., Paul P. Biemer, Lars E. Lyeberg, James T. Massey, Williams Nicholls, i Joseph Waksberg. Telephone Survey Methodology. Nueva York: John Wiley, 1988.
Cita MLA (9th ed.)Groves, Robert M., et al. Telephone Survey Methodology. John Wiley, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.