We can write powerful letters of recommendation, and then your references can sign them. (resumewritinggroup.com)
BMW will strengthen its momentum in 2014 by spearheading «Sheer Driving Pleasure» with powerful letters like «i», «M» and «X». (autosarena.com)
He discovered very painfully that in fact petitions weren't the way you should behave anymore, because he sent a copy to James Franck, who had been his colleague and his advisor and with whom he shared many things, and Franck wrote him a very touching but powerful letter saying that, «It's not our right as scientists just because we're scientists to intervene in all sorts of policy debate unless it's specific to our own concern. (manhattanprojectvoices.org)