Meier 2004:55, 63, Man and Environment in Schleswig-Holstein. Meier, Dirk (January 2004). "Man and environment in the marsh area of Schleswig–Holstein from Roman until late Medieval times". Quaternary International. 112 (1): 55–69. Bibcode:2004QuInt.112...55M. doi:10.1016/S1040-6182(03)00065-X.
Meier 2004:55–70, Man and environment in the marsh area of Schleswig-Holstein from Roman until late Medieval times. Meier, Dirk (January 2004). "Man and environment in the marsh area of Schleswig–Holstein from Roman until late Medieval times". Quaternary International. 112 (1): 55–69. Bibcode:2004QuInt.112...55M. doi:10.1016/S1040-6182(03)00065-X.
Louwe Kooijmans 1974, The Rhine/Meuse Delta, PhD Thesis. Louwe Kooijmans, L. P. (1974). The Rhine/Meuse delta. Four studies on its prehistoric occupation and holocene geology. Leiden: Leyden University Press. hdl:1887/27971. ISBN978-90-60-21194-6. OCLC1095248.
Meier 2004:55, 63, Man and Environment in Schleswig-Holstein. Meier, Dirk (January 2004). "Man and environment in the marsh area of Schleswig–Holstein from Roman until late Medieval times". Quaternary International. 112 (1): 55–69. Bibcode:2004QuInt.112...55M. doi:10.1016/S1040-6182(03)00065-X.
Meier 2004:55–70, Man and environment in the marsh area of Schleswig-Holstein from Roman until late Medieval times. Meier, Dirk (January 2004). "Man and environment in the marsh area of Schleswig–Holstein from Roman until late Medieval times". Quaternary International. 112 (1): 55–69. Bibcode:2004QuInt.112...55M. doi:10.1016/S1040-6182(03)00065-X.
Louwe Kooijmans 1974, The Rhine/Meuse Delta, PhD Thesis. Louwe Kooijmans, L. P. (1974). The Rhine/Meuse delta. Four studies on its prehistoric occupation and holocene geology. Leiden: Leyden University Press. hdl:1887/27971. ISBN978-90-60-21194-6. OCLC1095248.