What was the author/editor/source when the l.a. ranking was 1st?
CREATE TABLE "other" (
  "index_year" text,
  "author_editor_source" text,
  "year_of_publication" text,
  "countries_sampled" real,
  "world_ranking_1" text,
  "ranking_l_a_2" text
);
SELECT "author_editor_source" FROM "other" WHERE "ranking_l_a_2"='1st';