APA (7th ed.) Citation

Long, M., & Roberson, B. S. (1969). World problems : a topic geography / by M. Long and B.S. Roberson: A topic geography. English Universities Press.

Chicago Style (17th ed.) Citation

Long, Molly, and B. S. Roberson. World Problems : A Topic Geography / by M. Long and B.S. Roberson: A Topic Geography. London: English Universities Press, 1969.

MLA (9th ed.) Citation

Long, Molly, and B. S. Roberson. World Problems : A Topic Geography / by M. Long and B.S. Roberson: A Topic Geography. English Universities Press, 1969.

Warning: These citations may not always be 100% accurate.