APA   Click to copy
Gupta, J., Barick, K. C., & Bahadur, D. (2011). Defect mediated photocatalytic activity in shape-controlled ZnO nanostructures. Journal of Alloys and Compounds, 509, 6725–6730.

Chicago/Turabian   Click to copy
Gupta, Jagriti, KC Barick, and D Bahadur. “Defect Mediated Photocatalytic Activity in Shape-Controlled ZnO Nanostructures.” Journal of Alloys and Compounds 509 (2011): 6725–6730.

MLA   Click to copy
Gupta, Jagriti, et al. “Defect Mediated Photocatalytic Activity in Shape-Controlled ZnO Nanostructures.” Journal of Alloys and Compounds, vol. 509, Elsevier, 2011, pp. 6725–30.

@article{gupta2011a,
  title = {Defect mediated photocatalytic activity in shape-controlled ZnO nanostructures},
  year = {2011},
  journal = {Journal of Alloys and Compounds},
  pages = {6725--6730},
  publisher = {Elsevier},
  volume = {509},
  author = {Gupta, Jagriti and Barick, KC and Bahadur, D}
}