In The Regis Study Skills Guide, the authors note the importance of environment to a successful study period (Walsh and Reisig 10). Does the above MLA citation appear in a newspaper article, or a paraphrase of a online source, or a paraphrase of a printed book?

In The Regis Study Skills Guide, the authors note the importance of environment to a successful study period (Walsh and Reisig 10).

Does the above MLA citation appear in a newspaper article, or a paraphrase of a online source, or a paraphrase of a printed book?