Παραπομπή APA

Hagen, H., Hagen, H., & Roller, D. (1991). Geometric modelling: Methods and applications. Springer-Verlag.

Παραπομπή Chicago Style

Hagen, H.ed, H. Hagen, και D. Roller. Geometric Modelling: Methods and Applications. Berlin ; New York: Springer-Verlag, 1991.

Παραπομπή MLA

Hagen, H.ed, et al. Geometric Modelling: Methods and Applications. Springer-Verlag, 1991.