Strong book sales have helped cut Amazon's second-quarter (Q2) losses.

The company reported a net loss of $94 million for the quarter ending June 30, compared to a net loss of $168 million in the year-ago quarter.

During a conference call on Tuesday, Amazon CEO Jeff Bezos said: "I'm especially pleased with the job our US books team has been doing, noting the book unit's 20 per cent year-over-year growth."

Q2 revenue was $806 million, compared to $668 million during the same quarter last year – representing a 21 per cent increase.

International sales and third-party transactions also helped boost the company's sales, Bezos added. Sales from Amazon's sites in the UK, Germany, France and Japan sites grew 70 per cent during the quarter to $218 million.

The company raised expectations for its full-year 2002 results on Tuesday, expecting to see benefits from increased productivity and reined-in costs. Net sales are forecast to grow by 18 per cent for the full year.