Authors and dates do not have to be mentioned in-text, unless they add relevance to your narrative. In-text citations include numbers in square brackets that coordinate with the full citation listed in the reference list.
Single author: ...as shown by Brown [4], [5].
Multiple references : ...as mentioned earlier [2], [4], [5], [6], [7], [9].
Multiple-authored references, use et al. with three or more authors: ...Smith [4] and Brown and Jones [5]; Wood et al. [7].
You may treat the citations as nouns: ...as demonstrated in [3]; according to [4] and [6].