CREATE TABLE table_20193855_2 (year NUMBER, author_s__or_editor_s_ VARCHAR2)

In which year were the authors or editors Delia Sherman?
SELECT MAX(year) FROM table_20193855_2 WHERE author_s__or_editor_s_ = "Delia Sherman"
SELECT MAX("year") FROM "table_20193855_2" WHERE "Delia Sherman" = "author_s__or_editor_s_"