Jackson LS, Stafford JE (November 1987). "The evaluation and application of a radioimmunoassay for the measurement of diphenoxylic acid, the major metabolite of diphenoxylate hydrochloride (Lomotil), in human plasma". Journal of Pharmacological Methods. 18 (3): 189–97. doi:10.1016/0160-5402(87)90069-6. PMID3682841.
Jackson LS, Stafford JE (November 1987). "The evaluation and application of a radioimmunoassay for the measurement of diphenoxylic acid, the major metabolite of diphenoxylate hydrochloride (Lomotil), in human plasma". Journal of Pharmacological Methods. 18 (3): 189–97. doi:10.1016/0160-5402(87)90069-6. PMID3682841.