If I'm making a worship aid for the Palm Sunday liturgy and including some of the texts of the Mass, but not the complete readings from the Lectionary, do I need to attribute the text to ICEL? If so, how should I do it?

For that matter, on occasions when I make worship aids that DO include the full text of the readings (funerals, etc.), do I need to attribute the text to ICEL? Again, if so, how should I do it?