Não informado. Technical memorandum. Campden Food Preservation Research Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Technical Memorandum. Chipping Campden, Inglaterra: Campden Food Preservation Research Association.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Technical Memorandum. Campden Food Preservation Research Association.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.