Solfège des Solfèges, Complete, Book I, Book II and Book III: 337 Sight Singing Exercises

A revised and reworked edition of the 1891 classic A. Dannhäuser: "Solfège des Solfèges", including all three books.
The content of the book was restructured in chapters (the Exercise numbering is unchanged).
An audio recording of the book was created (sold separately in digital music stores).
For beginners we recommend the following introductory books:
I.J Farkas: Sight Singing for Beginners, Level 1
http://www.amazon.com/dp/B016CVTIUI
I.J Farkas: Sight Singing for Beginners, Level 2
http://www.amazon.com/Sight-Singing-Beginners-Level-Samples-ebook/dp/B019E5Y1M4

For Apple devices we recommend the iBooks store version of this book.