For more on Vrieslander see the article about him on the Schenker Documents Online website: [1].
"Annemarie Seidel (van Hoboken)" at Schenker Documents Online: [2]. Accessed 5 July 2016.
"Karl [Carl] Hermann Tautenhayn" at Schenker Documents Online: [Karl
[3], accessed 7 July 2016.
Schenker Documents Online website, Hoboken page: [4]. Deisinger (2015) gives instead 1934 as the terminal date of Hoboken's studies with Schenker.
This may be viewed on the Schenker Documents Online website both in the original German and in English translation: [5]. For more on the archive see, on the same site, [6]
