Interesting. I didn't know that. The Oxford Style Manual confirms what you say. (I'm not sure whether it's telling you to do that when quoting a French title in

Interesting. I didn't know that. The Oxford Style Manual confirms what you say. (I'm not sure whether it's telling you to do that when quoting a French title in English; it might just be talking about what to do when a book title appears in a passage in French.) Apparently the rule doesn't apply to the actual title page: the 1968 copy, which I happen to have and was able, somewhat surprisingly, to find in less than 60 seconds, has "Le chien jaune" on the title page, page 3.