As big boss said depents your application and your technique. Although Oscillator principles are the same in MCW RFIC and RF the techcniques used are not.
Good books i can suggest are:
Modern Communication Circuits 2nd Ed (maybe there is a newer)
Jack R. Smith
Mc Graw Hill
ISBN: 0-07-115586-4
Microwave Transistor Amplifiers Analysis and Design 2nd Ed (thats what i have there are newer editions as well)
Guillermo Gonzalez
Prentice and Hall
ISBN: 0-13-254335
Fundamentals of RF Circuit design with Low Noise Oscillators
Jeremy Everard
Willey
ISBN: 0-471-49793-2
The design of CMOS radio-frequency integrated circuits,
Thomas H. Lee.
Cambridge ; New York, NY, USA : Cambridge University Press, 1998.
RF microelectronics,
Behzad Razavi.
Upper Saddle River, NJ : Prentice Hall, c1998.
The above books cover a big frequency range and applications: