Frahm, Ellery, Sherriff, Jenni, Wilkinson, Keith N., Beverly, Emily J., Adler, Daniel S., and Gasparyan, Boris. Ptghni: A new obsidian source in the Hrazdan River basin, Armenia. Retrieved from https://par.nsf.gov/biblio/10083277. Journal of Archaeological Science: Reports 14.C Web. doi:10.1016/j.jasrep.2017.05.039.

Frahm, Ellery, Sherriff, Jenni, Wilkinson, Keith N., Beverly, Emily J., Adler, Daniel S., & Gasparyan, Boris. Ptghni: A new obsidian source in the Hrazdan River basin, Armenia. Journal of Archaeological Science: Reports, 14 (C). Retrieved from https://par.nsf.gov/biblio/10083277. https://doi.org/10.1016/j.jasrep.2017.05.039

Frahm, Ellery, Sherriff, Jenni, Wilkinson, Keith N., Beverly, Emily J., Adler, Daniel S., and Gasparyan, Boris. "Ptghni: A new obsidian source in the Hrazdan River basin, Armenia". Journal of Archaeological Science: Reports 14 (C). Country unknown/Code not available. https://doi.org/10.1016/j.jasrep.2017.05.039. https://par.nsf.gov/biblio/10083277.

@article{osti_10083277,
place = {Country unknown/Code not available}, title = {Ptghni: A new obsidian source in the Hrazdan River basin, Armenia}, url = {https://par.nsf.gov/biblio/10083277}, DOI = {10.1016/j.jasrep.2017.05.039}, abstractNote = {}, journal = {Journal of Archaeological Science: Reports}, volume = {14}, number = {C}, author = {Frahm, Ellery and Sherriff, Jenni and Wilkinson, Keith N. and Beverly, Emily J. and Adler, Daniel S. and Gasparyan, Boris}, }