Bukowski mentions Beiles reviewing Penguin Modern Poets 13

 'also Penguin Poetry [sic] 13 is out. but it won't be published in U.S. until June 26, this year. Bukowski-Norse-Lamantia. but we are already in trouble. the slick-poetry academy boys and poets are already after our asses. Sinclair Beiles wrote a good review of Penguin 13, said it was the best of the series, but London Magazine refused the print the review and Beiles sent it to a South African paper which also refused to publish the bit. Beiles wrote Norse that he thought Hal and I were the best living writers using the English language ...'

Letter to Jon and Louise Webb, Feburary 5, 1969

(published in Charles Bukowski, Selected Letters, Volume 2: 1965-1970, edited by Seamus Cooney, Virgin Books, 2004.)