I'm not an expert by any means, but what I do is see how high the score is and how they're treating it as far as level of giftedness. Anything over 155ish is probably SB L-M. Even though the WISC-IV has extended scoring, it is not widely used yet for score reporting (I don't think).
If it's a score that's harder to gauge like between 140-155ish, then see how impressed the author seems by it. If they're talking about it being a more moderate level of giftedness, then it's probably SB L-M. If they treat it like an extremely high score, then it's probably one of the modern tests.
