::::::::(edit conflict) If the book was published in 1992, then it pre-dates most of the significant medical literature on medical abortion. If you look at the major studies listed in Table 2 of the NEJM article, you'll see most if not all were published after 1992, including the landmark 1993 French paper (NEJM 1993, PMID 8479487).As for the Medicines book, there seems to be a 2003 edition (ISBN 0140515070), which is the most recent I can find. We've already gotten in trouble by relying on outdated editions of the OED and Black's Law Dictionary, so if we decide to cite this book, we need to use the most current edition at the very, very least. ''''''