Não informado. (1939). Bulletin of the Oxford University Institute of Statistics. Oxford University Institute of Statistics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bulletin of the Oxford University Institute of Statistics. Oxford, Inglaterra: Oxford University Institute of Statistics, 1939.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bulletin of the Oxford University Institute of Statistics. Oxford University Institute of Statistics, 1939.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.