PEHKONEN, A. Accuracy of timing in some time study methods. Agricultural and Food Science, [S. l.], v. 50, n. 1, p. 1–66, 1978. DOI: 10.23986/afsci.71957. Disponível em: https://journal.fi/afs/article/view/71957. Acesso em: 15 apr. 2025.