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APA
Perrett, K. (Kendall) & Donlan, Ruskin. (1985). Breakthrough mental arithmetic. Answers 5-6. Ken Perrett and Ruskin Donlan. North Ryde, N.S.W. : Methuen Australia
MLA
Perrett, K. (Kendall) and Donlan, Ruskin. Breakthrough mental arithmetic. Answers 5-6. Ken Perrett and Ruskin Donlan Methuen Australia North Ryde, N.S.W. 1985
Australian/Harvard
Perrett, K. (Kendall) & Donlan, Ruskin. 1985, Breakthrough mental arithmetic. Answers 5-6. Ken Perrett and Ruskin Donlan. Methuen Australia North Ryde, N.S.W.
Wikipedia
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{{Citation | title=Breakthrough mental arithmetic. Answers 5-6. Ken Perrett and Ruskin Donlan | author1=Perrett, K. (Kendall) | author2=Donlan, Ruskin | year=1985 | publisher=Methuen Australia | isbn=0454009496 | language=English | url=https://nla.gov.au/nla.cat-vn96933 | access-date=21 January 2025 | via=National Library of Australia }}