Almost all the references talk about bees collecting pollens and storing them in the pollen basket and finally bringing it to the hive. But, we also know that foragers engulf pollens and regurgitate it later. That is how it gets mixed in the nectar and thence found in the honey. I need some references that specify that ' bees consume pollens and regurgitate and that is how pollens get mixed in the honey...' 

The reference is important because pollen identification in honey is an important criterion for honey labelling.