Citrus Label Society: Collectors social organization in Southern California, USA.
Etichettando: Fruit labels collection, with label history, collecting information, duplicates for exchange. English and Italian translations.
Ludmila's Labels: Web gallery from a collector of fruit and vegetable labels/ stickers.
Spanish Citrus Historical Museum: English language site about the history of citrus in Spain, including pictures of vintage crate labels.
The World of Fruit Labels: Extensive database of stickers used on fruit products.