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APA-viiteLandon, M. B., Galan, H. L., Jauniaux, E. R., Driscoll, D. A., Berghella, V., Grobman, W. A., . . . Cahill, A. G. (2021). Gabbe's obstetrics: Normal and problem pregnancies (8th edition.). Elsevier.
Chicago-tyylinen lähdeviittausLandon, Mark B., Henry L. Galan, Eric R.M Jauniaux, Deborah A. Driscoll, Vincenzo Berghella, William A. Grobman, Sarah J. Kilpatrick, ja Alison G. Cahill. Gabbe's Obstetrics: Normal and Problem Pregnancies. 8th edition. Philadelphia (Pa.): Elsevier, 2021.
MLA-viiteLandon, Mark B., et al. Gabbe's Obstetrics: Normal and Problem Pregnancies. 8th edition. Elsevier, 2021.
Harvard-tyylinen lähdeviittausLandon, M. B., Galan, H. L., Jauniaux, E. R., Driscoll, D. A., Berghella, V., Grobman, W. A., . . . Cahill, A. G. 2021. Gabbe's obstetrics: Normal and problem pregnancies. 8th edition. Philadelphia (Pa.): Elsevier.