Gaya APA
Petritsch, Klaus. (2019).
Sustainable energy solutions .
:
IG Library.
Gaya Chicago
Petritsch, Klaus.
Sustainable energy solutions.
:
IG Library,
2019.
Electronic Resources.
Gaya MLA
Petritsch, Klaus.
Sustainable energy solutions.
:
IG Library,
2019.
Electronic Resources.
Gaya Turabian
Petritsch, Klaus.
Sustainable energy solutions.
:
IG Library,
2019.
Electronic Resources.