Hardcover
A hardcover, hardback, hardbound, or case-bound book is one bound with rigid protective covers (typically of cardboard covered with buckram or other cloth, heavy paper, or occasionally leather). It has a flexible, sewn spine which allows the book to lie flat on a surface when opened. Following the ISBN sequence numbers, books of this type may be identified by the abbreviation Hbk.
Hardcover
A hardcover, hardback, hardbound, or case-bound book is one bound with rigid protective covers (typically of cardboard covered with buckram or other cloth, heavy paper, or occasionally leather). It has a flexible, sewn spine which allows the book to lie flat on a surface when opened. Following the ISBN sequence numbers, books of this type may be identified by the abbreviation Hbk.