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 [ማተሚያ ከፊልም] (ጤና) ረቂቅ
Negash S, Sheppard NV, Lambert NM ndi Fincham FD Kugulitsa Pambuyo Panthawi Zokondweretsa: Zithunzi Zolaula Kugwiritsa Ntchito ndi Kutaya Nthawi Yopatsa in Journal of Research Research, 2015 Aug 25: 1-12.