Mulder, M. (1981). Questions and Answers (1–). https://oaks.kent.edu/node/8797
Mulder, Marge. 1981. “Questions and Answers”. https://oaks.kent.edu/node/8797.
Mulder, Marge. Questions and Answers. 1 Jan. 1981, https://oaks.kent.edu/node/8797.