APA

robbers j. e., speedie m. k. & tyler v. e. (1996). pharmacognosy and pharmacobiotechnology. london: williams and wilkins.

Chicago

robbers james e, speedie marilyn k and tyler varro e. 1996. pharmacognosy and pharmacobiotechnology. london: williams and wilkins.

Harvard

robbers j. e., speedie m. k. and tyler v. e. (1996). pharmacognosy and pharmacobiotechnology. london: williams and wilkins.

MLA

robbers james e, speedie marilyn k and tyler varro e. pharmacognosy and pharmacobiotechnology. london: williams and wilkins. 1996.