ある Oracle ストアド プロシージャを別のストアド プロシージャ内から呼び出すにはどうすればよいですか?

SET SERVEROUTPUT ON;

DROP PROCEDURE test_sp_1;
DROP PROCEDURE test_sp;

CREATE PROCEDURE test_sp
AS
BEGIN
    DBMS_OUTPUT.PUT_LINE('Test works');
END;
/

CREATE PROCEDURE test_sp_1
AS
BEGIN
    DBMS_OUTPUT.PUT_LINE('Testing');
    test_sp;
END;
/

CALL test_sp_1;

CALL <procedure_name>(<argument_list>);

CALL test_sp_1();

BEGIN
    test_sp_1;
END;
/

EXEC test_sp_1;

SET SERVEROUTPUT ON;
CREATE OR REPLACE PROCEDURE test_sp AS BEGIN DBMS_OUTPUT.PUT_LINE('Test works'); END;
/
CREATE OR REPLACE PROCEDURE test_sp_1 AS BEGIN DBMS_OUTPUT.PUT_LINE('Testing'); test_sp; END;
/
CALL test_sp_1(); -- Direct call
exec test_sp_1; -- SQL*Plus shortcut
BEGIN test_sp_1; END; -- Anonymous PL/SQL block

Testing
Test works
Testing
Test works
Testing
Test works