Gatz, K., & Hierl, F. (1954). Treppen + Treppenhauser =: Stairs and staircases = Esacaliers et cages d'escaliers == Scale e trombe di scale =. Muchen: Georg D. W. Callwey.
Παραπομπή Chicago StyleGatz, Konrad, and Fritz Hierl. Treppen + Treppenhauser =: Stairs and Staircases = Esacaliers Et Cages D'escaliers == Scale E Trombe Di Scale =. Muchen: Georg D. W. Callwey, 1954.
Παραπομπή MLAGatz, Konrad, and Fritz Hierl. Treppen + Treppenhauser =: Stairs and Staircases = Esacaliers Et Cages D'escaliers == Scale E Trombe Di Scale =. Muchen: Georg D. W. Callwey, 1954.
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