BALLAST, D. K. (1988). Architect's Handbook of formulas, tables, and mathe-matical calculations. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)BALLAST, David Kent. Architect's Handbook of Formulas, Tables, and Mathe-matical Calculations. New Jersey: Prentice Hall, 1988.
Lua MLA (9ú heag.)BALLAST, David Kent. Architect's Handbook of Formulas, Tables, and Mathe-matical Calculations. Prentice Hall, 1988.
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