APA (7th ed.) Zitazioa
Petschek, P. (2008). Grading for landscape architects and architects. Birkhauser.
Chicago Style (17th ed.) Zitazioa
Petschek, Peter. Grading for Landscape Architects and Architects. Basel: Birkhauser, 2008.
MLA (9th ed.) Zitazioa
Petschek, Peter. Grading for Landscape Architects and Architects. Birkhauser, 2008.
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