Negash S, Sheppard NV, Lambert NM እና Fincham FD ለወቅታዊው ደስታ ከሚያስደስት በኋላ የሽያጭ ዋጋ: የወሲብ ስራ ጥናት እና የቅናሽ ዋጋ ቅናሽ in ጆርናል ኦፍ ዎርክ ሪሰርች, 2015 Aug 25: 1-12.
Negash S, Sheppard NV, Lambert NM iyo Fincham FD Ganacsiga Later Dib U Qalitaan Loogu Talogalay Akhbaar Dheeraad ah: Isticmaalka Sawir-Maskaxeedka iyo Dib-u-dhigista Lacagta in Wargeyska Cilmi-baarista Galmada, 2015 Aug 25: 1-12.