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*"biographies for birdwatchers" - barbara and richard mearns isbn 0-12-487422-3* john edward gray, the indian pond heron and walsall (rspb walsall local group)* works by j. e. gray on internet archive
156–161 and plate v.==references==*"biographies for birdwatchers" - barbara and richard mearns isbn 0-12-487422-3==footnotes====external links==* john edward gray, the indian pond heron and walsall (rspb walsall local group)* works by j. e. gray on internet archive