anytime you see the directive 'How' in a question, answer by speaking about techniques.
you can link texts through techniques in two main ways:
1. Link the meaning expressed by the composer via various techniques. ie, establish a common idea of the meaning of the journey in your texts and then show how the composer creates that meaning with his/her use of techniques; or
2. Compare and contrast the techniques and the meanings they convey in various texts. ie, pick techniques that are common to at least two of your texts then show how the composers have used that technique, perhaps in conjunction with others individual to the particular text, to convey differing ideas on the meaning of journey. this works especially well with extended conceits and metaphors and symbolism and motifs. ummm, like two composers might use repetition of description of a setting and rising sun - but one uses it to show journeys in a positive light (opportunity for rebirth, rejuvenation etc.) whilst the other composer might use it to show journeys in a negative light (nihilistic etc. no matter what you do or what choices you make your journey has been pointless as it affected nothing etc.)
hope that helped at all, though i seriously doubt it...ah well.