Instances of Noninteractive Zero knowlege Proofs I am working on Cryptographic protocols. While I was doing a survey, I required some "Non-Interactive Zero Knowledge Proofs" (NIZK) which I can use.

I can only find transformations between different models of NIZK in the abstract sense, like the Hidden Bits Model (J.Katz) and non-malleable NIZK (A.Sahai)

Is there any credible material like Thesis/Papers where I can find example constructions of Non-Interactive Zero Knowledge Proofs which I can make use for my protocols.

Thanks!
I'm not sure what exactly you are looking for. 

Goldreich's book ("Foundations of Cryptography, volume 1") contains an extensive discussion of non-interactive ZK proofs. So do these lecture notes of Katz (lectures 11-13): http://www.cs.umd.edu/~jkatz/gradcrypto2/scribes.html.

You could also look at this paper: Uriel Feige, Dror Lapidot, Adi Shamir: Multiple NonInteractive Zero Knowledge Proofs Under General Assumptions. SIAM J. Comput. 29(1): 1-28 (1999) and references therein.