Zweifel, R. G.

1956. Two pelobatid frogs from the Tertiary of North America and their relationships to fossil and Recent forms. Amer. Mus. Novitates, 1762:1-45. April 6.

1958. Results of the Archbold Expeditions. No. 78. Frogs of the Papuan hylid genus Nyctimystes. Amer. Mus. Novitates, 1896:1-51. July 22.

1964. Life history of Phrynohyas venulosa (Salientia: Hylidae) in Panamá. Copeia, no. 1:201-208. March 26.

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