Free images results:
 

Citrus pictures, stock photos and images

 
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Lemon Royalty Free Stock Photography
Author: Radovan
Drink Stock Photo
Author: Abdone
Orange Stock Photos
Author: Red2000
Drink Stock Images
Author: Abdone
Drink Stock Photography
Author: Abdone
Drink Royalty Free Stock Photo
Author: Abdone
Fruit Royalty Free Stock Photography
Author: Pamelajane
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Citrus slice Royalty Free Stock Images
Author: Acik