In this paper we address in this paper the problem of nodes localization in wireless heterogeneous networks, focussing particularly on selection methods to estimate position. The OLSR routing protocol uses special nodes called Multipoint Relay (MPR) nodes to broadcast control messages within the network. We propose a novel approach based on using these Multipoint Relay (MPR) nodes as anchor nodes to estimate nodes positions. We evaluate its performance by simulation and compare it to other selection techniques such as convex hull selection and greedy selection.