Sambrook J & Fritsch E F Molecular Cloning : A Laboratory Manual Vol 3 .-Edn 2 - Edn 2 - Cold Springer Harbor Lab, U S A - pp 16.1-18.88,I.1-I.47,A.1-G.5; 27*23 Dewey Class. No.: G11:6/N89.3/B21773