Hulshoff Pol, L. (1989). The phenomenon of granulation of anaerobic sludge. Landbouwuniversiteit te Wageningen?.
Čikaški stil citiranja (17. izdanje)Hulshoff Pol, Look. The Phenomenon of Granulation of Anaerobic Sludge. [Wageningen, The Netherlands?: Landbouwuniversiteit te Wageningen?, 1989.
MLA način citiranja (8. izdanje)Hulshoff Pol, Look. The Phenomenon of Granulation of Anaerobic Sludge. Landbouwuniversiteit te Wageningen?, 1989.
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