| Leadership skills in the early years: Making a difference J O'Sullivan Bloomsbury Publishing, 2010 | 34 | 2010 |
| The SAGE handbook of early childhood policy L Miller, N Barbour, C Dalli, C Cameron The SAGE Handbook of Early Childhood Policy, 1-664, 2017 | 29 | 2017 |
| Pedagogical leadership in early childhood education: conversations from across the world M Sakr, J O'Sullivan Bloomsbury Publishing, 2022 | 13 | 2022 |
| Successful leadership in the early years J O'Sullivan Bloomsbury Publishing, 2015 | 11 | 2015 |
| Social leadership in early childhood education and care: An introduction J O'Sullivan, M Sakr Bloomsbury Publishing, 2022 | 8 | 2022 |
| Well-being in the Early Years C Bligh, S Chambers, C Davison, I Lloyd, J Musgrave, J O'Sullivan, ... Critical Publishing, 2013 | 7 | 2013 |
| Replacing a reading scheme with dialogic reading: an action research case study in 15 London nurseries J O’Sullivan International Journal of Early Years Education 29 (1), 25-40, 2021 | 2 | 2021 |
| Home learning: an exploration of parents perspectives J O’Sullivan International Journal of Early Years Education 31 (3), 613-626, 2023 | 1 | 2023 |
| Men in Childcare: Does it matter to children, what do they say?(Stage 2) H Perkins, T Edwards, J O'Sullivan London Early Years Foundation and University of Wolverhampton, 2018 | 1 | 2018 |
| A Childcare Social Enterprise: The London Early Years Foundation model J O’Sullivan L. Miller, C. Cameron, C., Dalli & N. Barbour (Hrsg.), The SAGE Handbook of …, 2017 | 1 | 2017 |
| Men Working in Childcare J O’Sullivan, S Chambers Does it matter to children, 2012 | 1 | 2012 |
| The expansion does not improve things for children from more disadvantaged backgrounds J O'Sullivan Early Years Educator 24 (6), 8-8, 2024 | | 2024 |
| A Manifesto for real change C Wright, J Fisher, J O'Sullivan, J Dubiel, N Leitch, D Wright Early Years Educator 24 (5), 6-10, 2023 | | 2023 |
| Understanding parent and staff perspectives on bicycle usage in nurseries and at home J O’Sullivan, S Nadat, L Roberts International Journal of Early Years Education, 1-16, 2023 | | 2023 |
| Dialogical conceptualisations of leadership in social enterprise early years group M Sakr, J O’Sullivan Early Years 43 (4-5), 938-951, 2023 | | 2023 |
| Growing the Community J O'Sullivan Early Years Educator 24 (3), S4-S5, 2023 | | 2023 |
| Engaging parents in sustainable practices J O'Sullivan Early Years Educator 24 (3), S8-S8, 2023 | | 2023 |
| Editor's note: Why we need to sow the seeds of sustainability from the Baby Room J O'Sullivan Early Years Educator 24 (3), S2-S2, 2023 | | 2023 |
| Reading for good J O'Sullivan Early Years Educator 24 (3), S6-S6, 2023 | | 2023 |
| Tackling the disadvantaged attainment gap in early years J O’Sullivan Early Years Educator 24 (2), 16-17, 2023 | | 2023 |
