Detwiler, S.R. and Copenhaver, W.M.The Developmental Behavior of Amblystoma Eggs Subjected to Atmospheres of Low Oxygen and High Carbon Dioxide, Am. J. Anat. 66: 393, 1940,
2.
Idem: Further Experiments Upon the Production of Developmental Abnormalities in Amblystoma, J. Exper. Zool. 88: 399, 1941.
3.
Copenhaver, W.M., and Detwiler , S.R.: Developmental Behavior of Amblystoma Eggs Subjected to Solutions of Indolebutyric Acid, Anat, Rec. 79: 247, 1941.
4.
Stockard, C.R. : Developmental Rate and Structural Expression: An Experimental Study of Twins, ''Double Monsters" and Single Deformities, and the Interaction Among Entbryonic Organs During Their Origin and Development , Am. J. Anat. 28: 115, 1921.