SPYRKA, Sandra. Use of Cohort Analysis in Study of Retention Processes. Edukacja Ekonomistów i Menedżerów, [S. l.], v. 23, n. 1, p. 128–137, 2012. DOI: 10.5604/01.3001.0009.5773. Disponível em: https://econjournals.sgh.waw.pl/EEiM/article/view/1544. Acesso em: 3 lip. 2024.