[cobirds] Reference book recommendations, please

Hi, all,
Juvenile and female hummers are swarming the yard and frying my brain. My long-standing approach has been the same head-in-the-sand approach I take to gull ID , but I've finally come to the conclusion that I need a good book on hummingbird ID, especially No American birds, and focused on juveniles and females. I'll need a picture book, please, but full-on comprehensive and detailed, please. Sibleys and Cornell not enough.
Thanks in advance for any reference recommendation.

Carol Blackard
carolblackard.com
Sent from my iPhone

--
You received this message because you are subscribed to the Google Groups "Colorado Birds" group.
To unsubscribe from this group and stop receiving emails from it, send an email to cobirds+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/5BEA0C0E-7C76-4FEC-8DC4-98E1151E401F%40icloud.com.