APA-viite (7. p.)

California Assessment Program. (1989). A Question of thinking: A first look at students' performance on open-ended questions in mathematics. The Department.

Chicago-viite (17. p.)

California Assessment Program. A Question of Thinking: A First Look at Students' Performance on Open-ended Questions in Mathematics. Sacramento, Calif: The Department, 1989.

MLA-viite (9. p.)

California Assessment Program. A Question of Thinking: A First Look at Students' Performance on Open-ended Questions in Mathematics. The Department, 1989.