Cryopreservation of human embryos at the pronucleate, early cleavage, or expanded blastocyst stages.

MLA

Troup, S. A., et al. “Cryopreservation of Human Embryos at the Pronucleate, Early Cleavage, or Expanded Blastocyst Stages.” European Journal of Obstetrics, Gynecology, and Reproductive Biology, vol. 38, no. 2, Jan. 1991, pp. 133–39. EBSCOhost, https://doi.org/10.1016/0028-2243(91)90190-v.

APA

Troup, S. A., Matson, P. L., Critchlow, J. D., Morroll, D. R., Lieberman, B. A., & Burslem, R. W. (1991). Cryopreservation of human embryos at the pronucleate, early cleavage, or expanded blastocyst stages. European Journal of Obstetrics, Gynecology, and Reproductive Biology, 38(2), 133–139. https://doi.org/10.1016/0028-2243(91)90190-v

Chicago

Troup, S A, P L Matson, J D Critchlow, D R Morroll, B A Lieberman, and R W Burslem. 1991. “Cryopreservation of Human Embryos at the Pronucleate, Early Cleavage, or Expanded Blastocyst Stages.” European Journal of Obstetrics, Gynecology, and Reproductive Biology 38 (2): 133–39. doi:10.1016/0028-2243(91)90190-v.