並前往https://books.google.com.tw/books?id=-Ld9DwAAQBAJ&pg=PA61&lpg=PA61&dq=Legal+validity&source=bl&ots=a8NY_x8hen&sig=ACfU3U2P5dfZTTB1j9ylPydWWLu-S5Vr0Q&hl=zh-TW&sa=X&ved=2ahUKEwjmz5LUpIH5AhWkQfUHHUw3DXcQ6AF6BQi7AhAD