APA

Stolker A. A., van Ginkel L. A., Stephany R. W., Maxwell R. J., Parks O. W. & Lightfield A. R. (19990715). Supercritical fluid extraction of methyltestosterone, nortestosterone and testosterone at low ppb levels from fortified bovine urine. : Journal of chromatography. B, Biomedical sciences and applications.

Chicago

Stolker A A, van Ginkel L A, Stephany R W, Maxwell R J, Parks O W and Lightfield A R. 19990715. Supercritical fluid extraction of methyltestosterone, nortestosterone and testosterone at low ppb levels from fortified bovine urine. : Journal of chromatography. B, Biomedical sciences and applications.

Harvard

Stolker A. A., van Ginkel L. A., Stephany R. W., Maxwell R. J., Parks O. W. and Lightfield A. R. (19990715). Supercritical fluid extraction of methyltestosterone, nortestosterone and testosterone at low ppb levels from fortified bovine urine. : Journal of chromatography. B, Biomedical sciences and applications.

MLA

Stolker A A, van Ginkel L A, Stephany R W, Maxwell R J, Parks O W and Lightfield A R. Supercritical fluid extraction of methyltestosterone, nortestosterone and testosterone at low ppb levels from fortified bovine urine. : Journal of chromatography. B, Biomedical sciences and applications. 19990715.