Question about citation (Me is new) 

In the section "Posthumous view of Brown's character", it says, "Unfortunately it is also this less studied, highly interpretive view of Brown that has prevailed in academic writing as well as journalism[citation needed]. "  I am wondering if James W. Lowen,Italic textLies My Teacher Told MeItalic text, (New York, NY: Touchstone, 1995) could be used for this citation.  It is primarily critiquing American high school textbooks, not secondary sources, but is highly critical of their treatment of Brown.  Lowen cites 18 textbooks in his 2007 edition, and comes to the conclusion that none give a fair description of Brown.

Um, To simplify the above, do textbooks (tertiary sources) count as "academic writing as well as journalism"?