Buschmann H., Christoph T., Friderichs E., Maul C., Sundermann B. Analgesics from Chemistry and Pharmacology to Clinical Application. - 2002. - pp. 181-182
Clarke's Analysis of Drugs and Poisons. - 4 ed. - London, 2011. - pp. 1219
Elks J., Ganellin C.R. Dictionary of Drugs: Chemical Data, Structures and Bibliographies. - Springer, 1990. - pp. 837
Kleemann A. Pharmaceutical Substances. - 2000. - pp. 616-617
The Merck Index 11th ed., Merck & Company, 1989. - pp. 466