I need a reference for the following statement: Given a smooth link $L \subset \mathbb{R}^3$, for a generic choice of a plane $P\subset \mathbb{R^3}$, the projection of the link $L$ on it is a smooth oriented immersed curve with finitely many double points where two strands intersect transversly.
I have read this statement in the book "Grid Homology for Knots and Links" by Peter S. Ozsvath, Andras I. Stipsicz, and Zoltan Szabo on page 14 but with no reference. Then there is a similar statement for PL-knots in "Knots" by Gerhard Burde and Heiner Zieschang on page 9, but I want it for smooth links. I also did not find anything in "Introduction to Knot Theory" by Lickorish and other classic books. Thanks for any help.