9781923123557 (ISBN)
http://nla.gov.au/nla.obj-3419122269
Langhorn, Katrina. (2024). The challenge journal : 12 Proven Steps to Improve Mental Health Retrieved December 8, 2025, from http://nla.gov.au/nla.obj-3419122269
Langhorn, Katrina. The challenge journal : 12 Proven Steps to Improve Mental Health Diamond Creek, Victoria: Ultimate World Publishing, 2024. Web. 8 December 2025 <http://nla.gov.au/nla.obj-3419122269>
Langhorn, Katrina. 2024, The challenge journal : 12 Proven Steps to Improve Mental Health Ultimate World Publishing, Diamond Creek, Victoria viewed 8 December 2025 http://nla.gov.au/nla.obj-3419122269
{{Citation
| author1=Langhorn, Katrina.
| title=The challenge journal : 12 Proven Steps to Improve Mental Health
| year=2024
| section=1 online resource.
| isbn=9781923123557
| location=Diamond Creek, Victoria
| publisher=Ultimate World Publishing
| url=http://nla.gov.au/nla.obj-3419122269
| id=nla.obj-3419122269
| access-date=8 December 2025
| via=Trove
}}
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