what's the author / editor / source with world ranking (1) being 73rd
CREATE TABLE "table" (
  "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 "table" WHERE "world_ranking_1"='73rd';