Warblers
From Amazon
The Warbler Guide 
From Amazon
The Warbler Road 
Warblers of Europe, Asia, and North Africa – Used Book in Good Condition. View on Amazon
Warblers and Other Songbirds of North America: A Life-size Guide to Every Species – HARPER DESIGN. View on Amazon
Sylvia Warblers : Identification, Taxonomy and Phylogeny of the Genus Sylvia – New; Mint Condition; Dispatch same day for order received before 12 noon; Guaranteed packaging; No quibbles returns. View on Amazon
Warblers of the Great Lakes Region and Eastern North America – Used Book in Good Condition. View on Amazon