Roberts, R. (2011). Celtx: Open source screenwriting : beginner's guide : write and market Hollywood-perfect movie scripts the free way! Packt Pub. Ltd..
Lua i Stíl Chicago (17ú heag.)Roberts, Ralph. Celtx: Open Source Screenwriting : Beginner's Guide : Write and Market Hollywood-perfect Movie Scripts the Free Way! Olton, Birmingham: Packt Pub. Ltd., 2011.
Lua MLA (9ú heag.)Roberts, Ralph. Celtx: Open Source Screenwriting : Beginner's Guide : Write and Market Hollywood-perfect Movie Scripts the Free Way! Packt Pub. Ltd., 2011.
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