The series is published in a small, affordable paperback format with a distinctive black and white cover design.

The novel was reprinted in paperback format on January 30, 1998.

The books were published in paperback format and as books.

When published, the novel was mass marketed in paperback format.

Prices now depend on whether a book is also available in paperback format.

A few titles near the end of the series were published in traditional paperback format with the spine on the long side.

The titles are widely available in a cheap paperback format.

The book became a best seller, and as of June 2009, had been released in paperback format.

The book sold fairly well and was reissued several times in paperback format.

Two new covers have been released for the book both in paperback format.