Analysis of information sources in references of the Wikipedia article "Chirpy Chirpy Cheep Cheep" in English language version.
In Britain it was a slow starter, but by June began to swiftly rise on the charts. By mid-August British sales were over 500,000, German over a million, Belgian 175,000 and other European sales made a total of over four million. The song became a hit in no fewer than 20 countries, the final tally being an estimated 10 million sales.
