APA

Marshall D. E., Gower D. B., Silver M., Fowden A. & Houghton E. (19990802). Cannulation in situ of equine umbilicus. Identification by gas chromatography-mass spectrometry (GC-MS) of differences in steroid content between arterial and venous supplies to and from the placental surface. : The Journal of steroid biochemistry and molecular biology.

Chicago

Marshall D E, Gower D B, Silver M, Fowden A and Houghton E. 19990802. Cannulation in situ of equine umbilicus. Identification by gas chromatography-mass spectrometry (GC-MS) of differences in steroid content between arterial and venous supplies to and from the placental surface. : The Journal of steroid biochemistry and molecular biology.

Harvard

Marshall D. E., Gower D. B., Silver M., Fowden A. and Houghton E. (19990802). Cannulation in situ of equine umbilicus. Identification by gas chromatography-mass spectrometry (GC-MS) of differences in steroid content between arterial and venous supplies to and from the placental surface. : The Journal of steroid biochemistry and molecular biology.

MLA

Marshall D E, Gower D B, Silver M, Fowden A and Houghton E. Cannulation in situ of equine umbilicus. Identification by gas chromatography-mass spectrometry (GC-MS) of differences in steroid content between arterial and venous supplies to and from the placental surface. : The Journal of steroid biochemistry and molecular biology. 19990802.