Parantheses at beginning of sentence

I have a problem when I cite at the beginning of a sentence. For example, I want to write

Costanza and Daly (1992) introduced the .....

What I get is

(Costanza and Daly, 1992) introduced the....

I can change this by hand, but whenever I update my citations it reverts back to the other way. How do I fix this?

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