Sarndal, C., Swensson, B., & Wretman, J. (1992). Model assisted survey sampling. Springer- verlag.
Chicago Style aipamenaSarndal, Carl-Erik, Bengt Swensson, and Jan Wretman. Model Assisted Survey Sampling. New York: Springer- verlag, 1992.
MLA aipamenaSarndal, Carl-Erik, et al. Model Assisted Survey Sampling. Springer- verlag, 1992.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.