APA
Royal Institution of Chartered Surveyors, . (1987). Land surveyors information package 21 : tides. London: Royal Institution of Chartered Surveyors.
Chicago
Royal Institution of Chartered Surveyors, . 1987. Land surveyors information package 21 : tides. London: Royal Institution of Chartered Surveyors.
Harvard
Royal Institution of Chartered Surveyors, . (1987). Land surveyors information package 21 : tides. London: Royal Institution of Chartered Surveyors.
MLA
Royal Institution of Chartered Surveyors, . Land surveyors information package 21 : tides. London: Royal Institution of Chartered Surveyors. 1987.