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First Book Mtshali worked as a messenger in Soweto before he became a poet , and his first book , Sounds of a Cowhide Drum ( 1971 ) , explores both the banality and extremity of apartheid through the eyes of working men of South Africa , even while it recalls the energy of those Mtshali frequently calls simply " ancestors . "
 Mtshali, Soweto, Mtshali
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mtshali, Soweto, Mtshali