RT Journal Article SR Electronic T1 Regulations, Proposals, Guidelines, Advisory Opinions, and Letters of Advice: What Legal Significance? JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 138 OP 141 VO 45 IS 3 A1 Horton, Linda R. YR 1991 UL http://journal.pda.org/content/45/3/138.abstract AB