Djerassi, Carl. "Isotope labelling and mass spectrometry of natural products" Pure and Applied Chemistry, vol. 9, no. 1, 1964, pp. 159-178. https://doi.org/10.1351/pac196409010159
Djerassi, C. (1964). Isotope labelling and mass spectrometry of natural products. Pure and Applied Chemistry, 9(1), 159-178. https://doi.org/10.1351/pac196409010159
Djerassi, C. (1964) Isotope labelling and mass spectrometry of natural products. Pure and Applied Chemistry, Vol. 9 (Issue 1), pp. 159-178. https://doi.org/10.1351/pac196409010159
Djerassi, Carl. "Isotope labelling and mass spectrometry of natural products" Pure and Applied Chemistry 9, no. 1 (1964): 159-178. https://doi.org/10.1351/pac196409010159
Djerassi C. Isotope labelling and mass spectrometry of natural products. Pure and Applied Chemistry. 1964;9(1): 159-178. https://doi.org/10.1351/pac196409010159