Não informado. (1920). Quarterly Publications of the American Statistical Association. American Statistical Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Quarterly Publications of the American Statistical Association. Boston, Mass: American Statistical Association, 1920.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Quarterly Publications of the American Statistical Association. American Statistical Association, 1920.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.