ACORN standards

This is a tricky one! Either of these formats is acceptable and should be marked as correct:
 

Reference:

Australian College of Perioperative Nurses. (2023). 2023 professional practice standards for perioperative nurse (PPSPN) for organisations. 

OR
 

Reference:

Australian College of Perioperative Nurses. (2023). The new ACORN standards: Vol.4. 2023 professional practice standards  for perioperative nurses (PPSPN) for organisations. 

In-text, first time:

Parenthetical citation: (Australian College of Perioperative Nurses [ACORN], 2023)

Narrative citation: Australian College of Perioperative Nurses (ACORN, 2023)

In-text, thereafter:

Parenthetical citation: (ACORN, 2023)

Narrative citation: ACORN (2023)

Notes:

• ACORN is the accepted acronym for Australian College of Perioperative Nurses not ACPN
• The publisher name is not included here as it's the same as the author
• The URL is not included as the work is not publicly available