A. F.  Skutch, ?Life history of the Keel-billed Toucan?, Auk, vol. 88, pp. 381-424, 1971.

A. F.  Skutch, ?Life history of the Bright-rumped Attila Attila spadiceus?, Ibis, vol. 113, pp. 316-322, 1971.

A. F.  Skutch, ?Life history of the Broad-billed Motmot, with notes on the Rufous Motmot?, Wilson Bulletin, vol. 83, pp. 74-94, 1971.