Brookfield, Michael E., Stebbins, Alan G., Rampino, Michael R., and Hannigan, Robyn E. Significance of carbon, nitrogen and their isotopic changes in a Permian-Triassic non-marine boundary section at Carlton Heights (Karoo Basin), South Africa. Retrieved from https://par.nsf.gov/biblio/10096046. Journal of African Earth Sciences 145.C Web. doi:10.1016/j.jafrearsci.2018.05.019.

Brookfield, Michael E., Stebbins, Alan G., Rampino, Michael R., & Hannigan, Robyn E. Significance of carbon, nitrogen and their isotopic changes in a Permian-Triassic non-marine boundary section at Carlton Heights (Karoo Basin), South Africa. Journal of African Earth Sciences, 145 (C). Retrieved from https://par.nsf.gov/biblio/10096046. https://doi.org/10.1016/j.jafrearsci.2018.05.019

Brookfield, Michael E., Stebbins, Alan G., Rampino, Michael R., and Hannigan, Robyn E. "Significance of carbon, nitrogen and their isotopic changes in a Permian-Triassic non-marine boundary section at Carlton Heights (Karoo Basin), South Africa". Journal of African Earth Sciences 145 (C). Country unknown/Code not available. https://doi.org/10.1016/j.jafrearsci.2018.05.019. https://par.nsf.gov/biblio/10096046.

@article{osti_10096046,
place = {Country unknown/Code not available}, title = {Significance of carbon, nitrogen and their isotopic changes in a Permian-Triassic non-marine boundary section at Carlton Heights (Karoo Basin), South Africa}, url = {https://par.nsf.gov/biblio/10096046}, DOI = {10.1016/j.jafrearsci.2018.05.019}, abstractNote = {}, journal = {Journal of African Earth Sciences}, volume = {145}, number = {C}, author = {Brookfield, Michael E. and Stebbins, Alan G. and Rampino, Michael R. and Hannigan, Robyn E.}, }