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Coaching career Mississippi Valley State Pettiford was the 11th head college football coach for the Mississippi Valley State University Delta Devils located in Itta Bena , Mississippi and he held that position for three seasons , from 1987 until 1989 .
 Mississippi Valley, Pettiford, Mississippi Valley State University Delta Devils, Itta Bena , Mississippi
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mississippi Valley, Pettiford, Mississippi Valley State University Delta Devils, Itta Bena , Mississippi