HOFFMAN-WALBECK, Thomas; ADAMS, Richard. Online Workflow Puzzle. Journal of Graphic Engineering and Design, [S. l.], v. 12, n. 1, p. 5–9, 2021. DOI: 10.24867/JGED-2021-1-005. Disponível em: https://sp.ftn.uns.ac.rs/index.php/jged/article/view/459. Acesso em: 6 oct. 2025.