In 2003 he published textbooks on religious studies for high schools.
He published several textbooks while teaching, and continued to work as a writer.
Black worked as an English teacher for about ten years, even publishing a textbook during that time.
From 1933 to 1937, he published several textbooks on Kurdish language education.
He has also published 12 monographies and textbooks so far.
During his years of teaching he published textbooks and didactic stories for children.
"It will continue to publish religious books, sports, textbooks, reference and science."
The company plans to publish open textbooks for the 125 most enrolled in college courses by 2014.
He was an early proponent of group voice teaching methods, and published a textbook on the subject in 1936.
Most departments have published textbooks and manuals for the students.