Petschek, P. (2008). Grading for landscape architects and architects. Birkhauser.
Lua i Stíl Chicago (17ú heag.)Petschek, Peter. Grading for Landscape Architects and Architects. Basel: Birkhauser, 2008.
Lua MLA (9ú heag.)Petschek, Peter. Grading for Landscape Architects and Architects. Birkhauser, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.