4 sentences

1. 这些资料仅供内部参考。

   zhè​xiē zī​liào jǐn gōng nèi​bù cān​kǎo.

   These materials are for internal reference only.

   Source: Dong Chinese Dictionary

2. 他的建议仅供参考。

   tā de jiàn​yì jǐn gōng cān​kǎo.

   His suggestions are for reference only.

   Source: Dong Chinese Dictionary

3. 图片仅供参考，请以实物为准。

   tú​piàn jǐn gōng cān​kǎo, qǐng yǐ shí​wù wéi​zhǔn.

   Pictures are for reference only; please refer to the actual product.

   Source: Dong Chinese Dictionary

4. 这个频道仅供紧急呼叫使用。

   zhè gè pín​dào jǐn gōng jǐn​jí hū​jiào shǐ​yòng.

   This channel's reserved for emergency calls only.

   Source: OpenSubtitles