hypergeometric 2f2 function reference

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Could anyone suggest a reference (book or paper, no URL though) for this identity involving the ${}_2F_{2}$ hypergeometric function?

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Hypergeometric functions $_pF_q$ whose parameters differ by integers are said to be contiguous; if $p\leq q+1$ then any $q+2$ distinct contiguous functions are linearly related. See the references listed in DLMF entry 16.3(ii).