complementary symmetry push-pull amplifier and wien bridge oscillator

hi...

i need some help over the title above..

there are two part of this circuit..wein bridge oscillator and another part is complementary symmetry push-pull amplifier

the wein bridge oscillator is to generate sinuisoidal wave and the other part is to amplify the wave...

the problem is i'm not really understand how to put the values of the components especially for the last part of the push-pull amplifier

can anyone please help me find the right circuits and determine the values as well..i'm really appreciate any reply..