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Springer-Verlag|year=1983 |isbn= 0-387-90788-2}}
*{{citation|last=Berger|first=Marcel|authorlink=Marcel Berger|title=Geometry revealed. A Jacob's ladder to modern higher geometry|translator= Lester Senechal|publisher= Springer|year=2010|isbn= 978-3-540-70996-1}}
*{{citation|first=Berndt|last=Bruce C.|authorlink= Bruce C. Berndt|last2= Knopp|first2= Marvin I.|authorlink2=Marvin Knopp|title=
Hecke's theory of modular forms and Dirichlet series|series=Monographs in Number Theory|volume =5|publisher= World Scientific|year= 2008|isbn=978-981-270-635-5}}
*{{citation|last=Busemann|first=Herbert|authorlink=Herbert Busemann|title=The geometry of geodesics|publisher= Academic Press|year=1955}}
*{{citation|last=Caratheodory|first=C.|authorlink=Constantin Caratheodory|title=Theory of functions of a complex variable. Vol. 2.|translator=F. Steinhardt. |publisher=Chelsea Publishing Company|year= 1954}}
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