A DOI is a digital object identifier. Citation styles now incorporate DOIs for electronic sources when present.
DOI: 10.4103/0973-1296.80661
Citation in APA:
Mueen, A. K. (2011, April). Citing Phcog Mag. articles made easy. Pharmacognosy Magazine. pp. 89-91. doi:10.4103/0973-1296.80661.