Ren, H., D.M. Sigman, M.-T. Chen, and S.-J. Kao. 2012. “Elevated Foraminifera-Bound Nitrogen Isotopic Composition During the Last Ice Age in the South China Sea and Its Global and Regional Implications”. Global Biogeochemical Cycles 26. doi:10.1029/2010GB004020.

Ren, H., D.M. Sigman, A. Martínez-García, R.F. Anderson, M.-T. Chen, A.C. Ravelo, M. Straub, G.T.F. Wong, and G.H. Haug. 2017. “Impact of Glacial Interglacial Sea Level Change on the Ocean Nitrogen Cycle”. Proceedings of the National Academy of Sciences of the United States of America 114. National Academy of Sciences: E6759-E6766. doi:10.1073/pnas.1701315114.