I agree with Ryan and Victor, except that you don't need presentations. The subgroup [GltimesH,GltimesH] is generated by [H,H]cup[G,H]cup[G,G], so you can write
(GltimesH)ab=(GltimesH)/langle[H,H]cup[G,H]cup[G,G]rangle.
If you apply the relators [H,H], you get GltimesHab; then if you apply the relators [G,H], you get Gtimes(Hab)G; then finally if you apply [G,G], you get Gabtimes(Hab)G. You can add this as an extra half-paragraph or footnote rather than giving a citation.
I don't think that the referee has the right to demand a longer explanation than this, unless maybe you are writing a textbook.
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