Cyclic Serialisation/Deserialsation

What is the best way to perform serialisation in PCL? This needs to encompass cyclic references as I have a hierarchey of objects which each reference their parent. normally I would use the BinaryFormatter which is not available in PCL.

I have read about NewtonSoft and also using JSON although wanted to ask the community if you have had any experience and can offer the best solution.

Thanks
Paul