In Stachowiak v. Subczynski, 411 Mich. 459; 307 N.W.2d 677 (1981), a medical malpractice case, the defendant was permitted to use charts taken from medical texts as sources on which he relied in choosing a conservative course of treatment for the plaintiff. Id. at 462. The trial court instructed the jury that the charts were not admitted to prove the truth of the matter asserted, i.e., that the defendant's decision to undertake a conservative course of treatment was proper, but rather to explain why he proceeded as he did. Id. at 462, 466, n 7.