a. https://books.google.es/books?id=x2zcDwAAQBAJ&pg=PA5&lpg=PA5&dq=Dramburg+residential+building+gropius+1907&source=bl&ots=vqNlAOK0Jn&sig=ACfU3U21Y1RIT_YF3cV3wan3WM0T6SEcZg&hl=en&sa=X&ved=2ahUKEwiWlsmX0sGCAxXLVqQEHX8YC0cQ6AF6BAgJEAM#v=onepage&q&f=false
a. https://books.google.es/books?id=x2zcDwAAQBAJ&pg=PA5&lpg=PA5&dq=Dramburg+residential+building+gropius+1907&source=bl&ots=vqNlAOK0Jn&sig=ACfU3U21Y1RIT_YF3cV3wan3WM0T6SEcZg&hl=en&sa=X&ved=2ahUKEwiWlsmX0sGCAxXLVqQEHX8YC0cQ6AF6BAgJEAM#v=onepage&q&f=false
a. https://books.google.es/books?id=x2zcDwAAQBAJ&pg=PA5&lpg=PA5&dq=Dramburg+residential+building+gropius+1907&source=bl&ots=vqNlAOK0Jn&sig=ACfU3U21Y1RIT_YF3cV3wan3WM0T6SEcZg&hl=en&sa=X&ved=2ahUKEwiWlsmX0sGCAxXLVqQEHX8YC0cQ6AF6BAgJEAM#v=onepage&q&f=false