Miles Morales is a student in Ms. Johnson's sixth grade class. Miles loves to read and always has several library books checked out, but he does not like to write. He believes he is incapable of writing. In fifth grade, he missed school during the unit about the parts of a letter, and his attempts to write letters for assignments were weak and unimpressive. He was present when the class studied how to write the opening, closing, and body of a letter, but he wasn't interested and didn't make an effort to complete the assignments. His grades on writing assignments have been poor for two years. Explain what Albert Bandura might say are the probable sources of Miles Morales' low self-efficacy for writing assignments.