CALLAHAN, M. T. (1992). Construction Project Scheduling Michael T. Callahan, Daniel G. Quackenbush. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)CALLAHAN, Michael T. Construction Project Scheduling Michael T. Callahan, Daniel G. Quackenbush. McGraw-Hill, 1992.
Lua MLA (8ú heag.)CALLAHAN, Michael T. Construction Project Scheduling Michael T. Callahan, Daniel G. Quackenbush. McGraw-Hill, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.