Nachtregels : Words Without Thoughts Never To Heaven Go. - Bosma, Marja; Coelewij, Leontine; Deiters, Patricia; Delfgauw, Leo; Ex, Sjarel; Geerling, Let; Herst, Sonja; Hettig, Frank-Alexander; Hoenjet, Frank; Jansen, Bert; Jongstra, Atte; Schopping, Hans; et al. (Centraal Museum,, 1991)