APA
(2016). The troika of adult learners, lifelong learning, and mathematics. New York, NY: Springer Berlin Heidelberg.
Chicago
2016. The troika of adult learners, lifelong learning, and mathematics. New York, NY: Springer Berlin Heidelberg.
Harvard
(2016). The troika of adult learners, lifelong learning, and mathematics. New York, NY: Springer Berlin Heidelberg.
MLA
The troika of adult learners, lifelong learning, and mathematics. New York, NY: Springer Berlin Heidelberg. 2016.