- ABNT:
DE LANGEN, F. H. T. Strategies for Sustainable Business Models for Open Educational Resources. International Review of Research in Open and Distance Learning, [s. l.], v. 14, n. 2, p. 53–66, 2013. Disponível em: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=eric&AN=EJ1008092&custid=s8280428. Acesso em: 9 dez. 2019.
- AMA:
de Langen FHT. Strategies for Sustainable Business Models for Open Educational Resources. International Review of Research in Open and Distance Learning. 2013;14(2):53-66. http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=eric&AN=EJ1008092&custid=s8280428. Accessed December 9, 2019.
- APA:
de Langen, F. H. T. (2013). Strategies for Sustainable Business Models for Open Educational Resources. International Review of Research in Open and Distance Learning, 14(2), 53–66. Retrieved from http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=eric&AN=EJ1008092&custid=s8280428
- Chicago/Turabian: Author-Date:
de Langen, F. H. T. 2013. “Strategies for Sustainable Business Models for Open Educational Resources.” International Review of Research in Open and Distance Learning 14 (2): 53–66. http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=eric&AN=EJ1008092&custid=s8280428.
- Harvard:
de Langen, F. H. T. (2013) ‘Strategies for Sustainable Business Models for Open Educational Resources’, International Review of Research in Open and Distance Learning, 14(2), pp. 53–66. Available at: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=eric&AN=EJ1008092&custid=s8280428 (Accessed: 9 December 2019).
- Harvard: Australian:
de Langen, FHT 2013, ‘Strategies for Sustainable Business Models for Open Educational Resources’, International Review of Research in Open and Distance Learning, vol. 14, no. 2, pp. 53–66, viewed 9 December 2019, .
- MLA:
de Langen, F. H. T. “Strategies for Sustainable Business Models for Open Educational Resources.” International Review of Research in Open and Distance Learning, vol. 14, no. 2, June 2013, pp. 53–66. EBSCOhost, search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=eric&AN=EJ1008092&custid=s8280428.
- Chicago/Turabian: Humanities:
de Langen, F. H. T. “Strategies for Sustainable Business Models for Open Educational Resources.” International Review of Research in Open and Distance Learning 14, no. 2 (June 1, 2013): 53–66. http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=eric&AN=EJ1008092&custid=s8280428.
- Vancouver/ICMJE:
de Langen FHT. Strategies for Sustainable Business Models for Open Educational Resources. International Review of Research in Open and Distance Learning [Internet]. 2013 Jun 1 [cited 2019 Dec 9];14(2):53–66. Available from: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=eric&AN=EJ1008092&custid=s8280428