THOMAS, P. I. (1991). The Contractor's Field Guide. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)THOMAS, Paul I. The Contractor's Field Guide. Prentice-Hall, 1991.
Lua MLA (8ú heag.)THOMAS, Paul I. The Contractor's Field Guide. Prentice-Hall, 1991.
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