A. K. Roy, and S. Dudeja P.N. Singh

title	ISBN-13	year of publication
New Countdown Book 1	978-0-19-906181-5	2014
New Countdown Book 1	978-962-19-1717-1	2014
New Countdown Book 2	978-0-19-906182-2	2014
New Countdown Book 3	978-0-19-906183-9	2014
New Countdown Book 4	978-0-19-906184-6	2014
New Countdown Book 5	978-0-19-906185-3	2014
New Countdown Book 5	978-963-7969-59-1	2014
New Countdown Book 6	978-0-19-579883-8	2014
New Countdown Book 6	978-966-936-380-0	2014
New Countdown Book 7	978-0-19-579884-5	2014
New Countdown Book 8	978-0-19-579885-2	2014
New Countdown Primer A	978-0-19-906179-2	2014
New Countdown Primer A	978-967-5606-60-1	2014
New Countdown Primer B	978-0-19-906180-8	2014
New Countdown Teaching Guide 1	978-0-19-906187-7	2014
New Countdown Teaching Guide 1	978-966-7211-96-7	2014
New Countdown Teaching Guide 2	978-0-19-906188-4	2014
New Countdown Teaching Guide 3	978-0-19-906189-1	2014
New Countdown Teaching Guide 4	978-0-19-906190-7	2014
New Countdown Teaching Guide 4	978-964-13-9920-9	2014
New Countdown Teaching Guide 5	978-0-19-906191-4	2014
New Countdown Teaching Guide 5	978-966-2473-42-1	2014
New Countdown Teaching Guide Primer A & B	978-0-19-906186-0	2014
New Countdown Teaching Guide Primer A & B	978-967-64-4448-6	2014