MLA wrote:
Because it is increasingly common for papers and manuscripts to be prepared with a single space after all punctuation marks, this spacing is shown in the examples in the MLA Handbook and the MLA Style Manual. As a practical matter, however, there is nothing wrong with using two spaces after concluding punctuation marks unless an instructor or editor requests that you do otherwise.
Poll
Do you put one or two spaces after a period?
| One | 64% | 64% - 94 | ||||
| Two | 35% | 35% - 52 | ||||
| Total: 146 | ||||||