You can find the digital versions at Jazzhacker's official site or through the Google Play Store.
Each page displays the scale's name, formula (intervals), and specific note names in all 12 keys. Jazzhacker Scales and Modes for 4-String Bass
Are you focusing on a like Jazz or Blues, or just looking to improve your overall fretboard navigation ? Ebooks New - Jazzhacker You can find the digital versions at Jazzhacker's