B. Dick: Grounded theory: a thumbnail sketch – Very good (and short) introductory text by Bob Dick on grounded theory, mostly following Glaser’s approach.
U. Flick (ed.): Qualitative Forschung: Ein Handbuch – About 60 overview texts on qualitative research, German.
Don Ihde: Experimental Phenomenology, 2nd edition – Famous introduction to phenomenology and it’s practice. Well-written. First chapter can be downloaded for free.