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"Fennel bulb, raw per 100 g". FoodData Central, US Department of Agriculture. 30 October 2020. Archived from the original on 25 October 2019. Retrieved 10 April 2024.
"Foeniculum vulgare Mill". Plants of the World Online. Royal Botanic Gardens, Kew. 2023. Archived from the original on 16 January 2023. Retrieved 22 January 2023.