What supply voltage for the Abracon crystal oscillators?
That's a crystal. Crystals don't have a supply. They are passive elements. 

You might be confusing this with an integrated oscillator, maybe, which contains a crystal, an inverting amplifier and an output buffer in one package. Those need a supply voltage and are useful as standalone oscillation generators. The crystal you link to needs to be driven from something that has clock pins, e.g. a microcontroller.