Reffner, M. (1993). Old Trains of Thought. https://oaks.kent.edu/node/9034
Reffner, Mark. 1993. “Old Trains of Thought”. https://oaks.kent.edu/node/9034.
Reffner, M. Old Trains of Thought. 1 Jan. 1993, https://oaks.kent.edu/node/9034.