葉隠
Currently in reprint due to interest stemming from the film Ghost Dog: The Way of the Samurai.
Hagakure was originally written down by Tashiro Tsuramoto and is the result of seven years of conversations he had with Yamamoto Tsunetomo, a retired samurai. The meetings between the two began in 1710, and Hagakure was first bound in 1716.
There are no surviving original manuscripts. The current translation is based on four separate copies, all with slight variations. These are known as the Kurihara-hon, the Takashiro-hon, the Nakano-hon and (primarily) the Mochiki Nabeshimake-hon.
Translated from the Japanese by William Scott Wilson. Wilson chose to include only 300 of the 1300 passages, selecting those he felt were either the core of Hagakure or were simply interesting to a western audience.
Thanks to Shro0m for the kanji.