翻译简单的一句话，在线等~

I'd like to know who wrote these two recommendation letters.

我想知道这两份推荐信来自于谁

I want to know who wrote these two recommendations ?

recommendations 就表示推荐信，不用letter

I'd like to know whom do these two recommendation belongs to

I want to know who the two recommendatory letters are from?

I want to know those writers of these two recommendations?