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M Oehler (2007). The earth-sheltered solar greenhouse book: how to build an energy-free year-round greenhouse. Mole Pub. Co. ISBN9780960446407. OCLC184985256.
P Vetsch, E Wagner, C Schubert-Weller (1994). Erd- und Höhlenhäuser von Peter Vetsch = Earth and cave architecture (in German). A. Niggli. ISBN9783721202823. OCLC441647358.{{cite book}}: CS1 maint: multiple names: authors list (link)