Proposition 1.2.10 in "Cohen-Macaulay Rings" by W. Bruns, H.J. Herzog: if $R$ is a Noetherian ring, $I$ an ideal of $R$, and $M$ a finite $R$-module, then $$\operatorname{grade} (I,M)= \inf \{\operatorname{depth} M_p | p \in V(I)\}.$$

Proposition 1.2.10(a) in "Cohen–Macaulay Rings" by W. Bruns, H.J. Herzog: if $R$ is a Noetherian ring, $I$ an ideal of $R$, and $M$ a finite $R$-module, then $$\operatorname{grade} (I,M)= \inf \{\operatorname{depth} M_p \mid p \in V(I)\}.$$

Bruns-Herzog, Proposition 1.2.10.
Let R be a Noetherian ring, I an ideal of R, and M a finite R_module. Then $$grade (I,M)= inf \{depth M_p | p \in V(I)\}.$$

Proposition 1.2.10 in "Cohen-Macaulay Rings" by W. Bruns, H.J. Herzog: if $R$ is a Noetherian ring, $I$ an ideal of $R$, and $M$ a finite $R$-module, then $$\operatorname{grade} (I,M)= \inf \{\operatorname{depth} M_p | p \in V(I)\}.$$