Heijman, W. J. M. (1991). Depletable resources and the economy. Wageningen: Landbouwuniv. Wageningen Agricultural University.
Chicago Style aipamenaHeijman, Willem Johannes Maria. Depletable Resources and the Economy. Wageningen: Landbouwuniv. Wageningen Agricultural University, 1991.
MLA aipamenaHeijman, Willem Johannes Maria. Depletable Resources and the Economy. Wageningen: Landbouwuniv. Wageningen Agricultural University, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.