Levine, H. (1985). Classifying immersions into R4 over stable maps of 3-manifolds into R2. Springer-Verlag.
Citazione stile Chigago Style (17a edizione)Levine, Harold. Classifying Immersions into R4 over Stable Maps of 3-manifolds into R2. Berlín: Springer-Verlag, 1985.
Citatione MLA (9a ed.)Levine, Harold. Classifying Immersions into R4 over Stable Maps of 3-manifolds into R2. Springer-Verlag, 1985.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.