Verkuyl, H. J., Swart, H., & Hout, A. (2005). Perspectives on Aspect. Springer Netherlands. https://doi.org/10.1007/1-4020-3232-3

Verkuyl, Henk J., Henriette Swart, and Angeliek Hout. Perspectives on Aspect. Dordrecht: Springer Netherlands, 2005. https://doi.org/10.1007/1-4020-3232-3.

Verkuyl, Henk J., et al. Perspectives on Aspect. Springer Netherlands, 2005. https://doi.org/10.1007/1-4020-3232-3.