Keller Gerald. (2012). Managerial Statistics (9th.). cengage learning.
Chicago Style aipamenaKeller Gerald. Managerial Statistics. 9th. Delhi: cengage learning, 2012.
MLA aipamenaKeller Gerald. Managerial Statistics. 9th. cengage learning, 2012.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.