TS/93. (1956). The Design And Analysis Of Helicoidal Stairs. Godwin.
Lua i Stíl Chicago (17ú heag.)TS/93. The Design And Analysis Of Helicoidal Stairs. Godwin, 1956.
Lua MLA (8ú heag.)TS/93. The Design And Analysis Of Helicoidal Stairs. Godwin, 1956.
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