Na http://www.ssdd.uce.ac.uk/learner/grammar/apostrop.htm (sajt UCE Birmingham, Staff and Student Development Department) stoji:
An apostrophe can be used for the plural of abbreviations such as PC's or CD's, but even here it is not necessary. PCs or CDs look better. The only case where you do need an apostrophe for the plural is with special words and expressions which are not usually found in the plural (and as such should probably not be used in your writing). For example:
No if's or but's, get off to bed now!
Znači, može i jedno i drugo, ali se preporučuje bez apostrofa.
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