Engels, Friedrich, 1820-1895, author
Fereign Languages Publishing House, 1954
Buku Teks
Bruggencate, K. Ten, author
H.D. Tjeenk Willink, 1975
Buku Referensi
Will, Frederic
Twayne , 1969
Buku Teks
Bastide, J. A. Jockin la, author
Van Goor Zonen, 1978
Buku Referensi
Bruggencate, K. Ten, author
J.B. Wolters-Groningen, [Date of publication not identified]
Buku Referensi