One crystal reference for several mixers?

[btadeyl001]

For a narrowband receiver I'm designing, I have been using the Phillips SA605 mixer/FM receiver with the narrowest Murata ceramic filters (CFWLA455KJFA - available through Mouser by the way). Works great - extremely sensitive. However, I now want to build a board with four receiver chips and reference them all to the same local oscillator. Can anyone give me a clue on how to do this?

I'm not sure whether to hook up the oscillator as usual with one chip and then tap into it to supply "external LO" for the others, or, to build a separate oscillator circuit, buffer it, and use it to to supply external LO to the four receivers.

Thanks for any help!
BenL