how to find the values of Phase-shift Oscillator?

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hey! i've completed my oscillator with three opamp but the output is not going beyond 8v. if i'm decreasing the gain, the sine wave is coming fine (without clipping) but i want that if i'm applying 12Vdc I should have 12vAc.i'm not understanding why this is happening.?
without thes non-inverting amplifiers the Rf is 19k and the sine wave is coming fine.but as i'm increasing the non-inverting amplifiers the sine wave is getting clipped but the output voltage is not going ahead 8v.
an OpAmp is able to give move than 8v. am i right.?
any guass? help me Thanks
here is the circuit
 

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