Hi Armando,

"Oscillators" or "Clock Oscillators" that are in the 4 pin "can", generally follow a standard IC pin out count.

The pins are counted like a standard DIP chip.
Except that the pins not located at the 4 corners are omitted (and still counted).

Some come in a "8 pin" footprint. Some have a "14" pin footprint.
Generally they have:
a V+ pin (3.3V or 5V), a ground pin (sometimes two), an output pin.

Just Google the part number and the data sheet should give you all the information needed.
If you have trouble, post the markings and someone will help look it up.

-Adam-