Gaya APA
Grabis, J. et al (2013).
The Practice of enterprise modeling ; 6th IFIP WG 8.1 Working Conference, PoEM 2013, Riga, Latvia, November 6-7, 2013, Proceedings .
Heidelberg:
Springer Berlin.
Gaya MLA
Grabis, Janis. et al.
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Heidelberg:
Springer Berlin,
2013.
Electronic Resource.