ዲ ኬሴሬዲ, ዋልተር; ሻዋርትዝ, ማርቲን. የሰው ልጅ እና ህብረት; ዊቺታ. KS ቁ. 22 ፣ ኢሳ. 2, (ሜይ 1, 1998): 137.
አገናኝ - https://journals.sagepub.com/doi/abs/10.1177/016059769802200202
ዲ ኬሴሬዲ, ዋልተር; ሻዋርትዝ, ማርቲን. የሰው ልጅ እና ህብረት; ዊቺታ. KS ቁ. 22 ፣ ኢሳ. 2, (ሜይ 1, 1998): 137.
አገናኝ - https://journals.sagepub.com/doi/abs/10.1177/016059769802200202