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My source of this is in annual Review of Astronomy and Astrophysics
Vol.6, page 307, in an article by Goldreich and Peale. They state:
"We have seen that the rotational period of Venus is with in a few
tenth of a day 243 day retrograde. If the period is 243.16 days the
same face of Venus will be oriented toward the Earth at each
conjunction of the Earth and Venus."