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Internetreferenties
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Persoonlijke communicatie
Persoonlijke communicatie: Lefevre, T., zaakvoerder Hortipower bvba, 13 december 2011, mondelinge vragenlijst.
Persoonlijke communicatie: Lefevre, T., zaakvoerder Hortipower bvba, 31 maart 2012, email.
Persoonlijke communicatie: Stoffels, P., zaakvoerder Stoffels bvba, 2 juni 2012, email.