The information on this website has been gathered from various sources.
Personal experience. Personal smelling and inspection of various concentrations, vintages and bottle editions of all perfumes described in the Perfumes section.
Guerlain. Conversations and email correspondence with Guerlain's PR manager Isabelle Rousseau, sales assistants from the Champs-Élysées boutique and artistic director Sylvaine Delacourte. Conference with perfumer Thierry Wasser.
Blogs, forums and experts. Readings of numerous perfume blogs and forums, notably Basenotes, Perfume Shrine, Perfume of Life, osMoz.com and Now Smell This. Exchanges with other Guerlain collectors and connoisseurs. A very special thank you to Linda Primeau, B.A. and Guerlain Fragrance Specialist, without whose enthusiastic input and continuing editing this place would not have been the same.
Literature. Reference books and other publications about Guerlain's perfumes, perfumers, bottles and history.

Guerlain's in-house training manual from 1999.

Jean-Paul Guerlain's "diary" from 2010 about the passions and love affairs behind some of his most beloved perfumes.

Jean-Paul Guerlain's 2002 autobiography in which he looks back on his family's story and his own work as a perfumer, notably his many travels for raw materials.

Guerlain marked its 150th anniversary in 1978 with a promotional book. In 96 pages, Ariel Ricaus-Barsi tells us about the classic highlights during Guerlain's first 150 years, and illustrations show both rare advertisement prints and more private photos of interesting events, such as the opening of the new factory in Courbevoie after World War II.

Diary notes from the hand of Jean-Paul Guerlain gathered in this small book to commemorate his 1998 perfume Guerlinade.

Guerlain's coffee table book from 2006 to celebrate the renovation of La Maison Guerlain the year before as well as the house's new exclusive lines Les Parisiennes and L'Art et la Matière, the new perfume Insolence and the sixty-eight ingredient scent Cologne du 68.

Indispensable book by Michèle Atlas and Alain Monniot about Guerlain perfume bottles since 1828. Published in 1997. Jean-Paul Guerlain has signed the foreword.

Colette Fellous' book from 1989 is still today regarded as the most exhaustive and detailed account of Guerlain's perfumers, creations, ideas and the time and culture that have sorrounded all the events in the house's grand history.

Michael Edwards is a connoisseur and an authority in the subject of perfume. This is a reference book (1996) on French feminine fragrances that made a mark in 20th century perfumery.

Perfume critics Luca Turin and Tania Sanchez' guide and reviews of hundreds of perfumes.

Former UK Guerlain spokesman Roja Dove's 2008 book about the world's major perfumes.